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MEXICO CITY — Environmentalist groups accused Mexico’s government of lying about the source of a massive oil spill in the Gulf of Mexico, something authorities promptly denied.

The spill of off the coast of the southern state of Veracruz has spread more than 373 miles and into seven nature reserves. Turtles and other marine life have been found on sea shores coated in oil, and fishermen have been unable to work in waters they have fished for decades.

Mexico’s government reported that 800 tons of hydrocarbon-laden waste have spilled into the ocean. The government said the spill started in March and the sources were a ship anchored off the coastal state of Veracruz and two sites from which oil naturally flows.

On Monday, a group of 17 organizations — including Greenpeace Mexico, the Mexican Alliance Against Fracking and the Mexican Center for Environmental Rights, or CEMDA — contradicted that claim and said that satellite images they captured show the root of the spill was actually a pipeline from Mexico’s state-run oil company, Pemex, and that a large oil slick appeared in early February.

“All this lack of information is causing massive economic and environmental damage. So far no one has been held accountable,” Margarita Campuzano, spokesperson for CEMDA, said Tuesday.

Images from February circulated by the activists match images obtained by The Associated Press on Tuesday through Copernicus, the European climate agency. The photos show a boat floating over a sea clouded with what the groups say is oil, which appears to be streaming out of a platform.

The groups said that the boat in the images is Árbol Grande, which specializes in pipeline repair — implying that the government knew about the spill before it had reported it and “hid it.”

Pemex called the information and images circulated by the groups “inaccurate” and said the Árbol Grande boat traverses the Gulf of Mexico continually, “carrying out preventive inspections of platforms and specialized spill response operations.”

Campuzano called for greater transparency and more aggressive investigations by authorities.

“They’re trying to dilute their responsibility when technology makes it very easy to know where this occurred and who is responsible,” she said.

Mexican President Claudia Sheinbaum on Tuesday denied the accusations during her morning press briefing and said that up until now, “no leak has been reported” in state oil infrastructure and that such natural seeps in the Gulf have happened in the past.

She said the government was investigating with scientists whether the spill was “due to these natural seeps in the area, which have been reported on many occasions and are well-documented in scientific literature, or a leak from one of the facilities.”

Sheinbaum said that it was more probable that the spill came from the natural seeps, and added that teams were hard at work cleaning up the spill and mitigating the effects.

While government officials recognized the impacts on turtles, birds and fish, and the spread to protected ecosystems, they also insisted that it had not caused “severe environmental damage.”

The accusations come as environmental groups in the United States have also raised alarm after the Trump administration exempted oil and gas drilling in the Gulf of Mexico from the Endangered Species Act, saying environmentalists’ lawsuits threatened to hobble domestic energy supplies during the U.S.-Israeli war with Iran.

Critics said the move could harm marine life and also doom a rare whale species.

Janetsky writes for the Associated Press. Associated Press writer Teresa de Miguel in Mexico City contributed to this report.

Imagine waking up early, eager to peep dazzling carpets of brilliant orange flowers at the Antelope Valley California Poppy Reserve. Instagram posts promised a spectacle.

You drive to the reserve north of Los Angeles, but the rolling hills aren’t alive with color.

Bummer. The bloom is over.

Thanks to AI, and a local scientist, such disappointment may soon be a thing of the past.

This year, Steve Klosterman, a biologist who works on natural climate solutions, launched a “wildflower forecast,” powered by a deep-learning model, satellite imagery and weather data.

In a sense, Klosterman, of Santa Monica, developed the tool to meet his own need.

Last spring, the Midwest transplant was hankering to see some wildflowers. He assumed there was some online resource that offered predictions or leveraged satellite images.

“Surely, there must be something,” he recalled thinking. “But there was nothing.”

There are tools. The state reserve operates a live cam trained on one swath of land. Theodore Payne, a California native plant nursery and education center, runs a wildflower hotline, where people can call in and hear weekly recorded reports on hot spots.

“These are all essential resources,” Klosterman said. “At the same time, they’re limited.”

Klosterman isn’t green when it comes to plants. His PhD, at Harvard, focused on the timing of new leaves on trees in the spring and color change in the fall.

For a class project, a team he was part of built a website that predicted those leaf changes in the Boston area. It was a hit.

California poppies bloom in Lancaster, near the state natural reserve, in mid-March.

(Kayla Bartkowski / Los Angeles Times)

To create the poppy bloom predictor, Klosterman turned to AI initially developed for medical imaging. He has harnessed it to instead analyze satellite images of the Antelope Valley.

The model scans 10-by-10-meter squares of land to determine whether poppies are present by their telltale orange color. (It also identifies tiny yellow flowers called goldfields.)

The model is trained on satellite images — which go back nine years — along with past weather data.

It then uses the current forecast, and recent flower status, to peer into the future.

If the mercury is going to hit 100 degrees and wind is picking up — and in previous years that led to withering flowers — that will guide the prediction.

Right now, the model can forecast five days out and is, as Klosterman puts it, “very much a work in progress.” It would be better, more powerful, if it had 100 years to learn from.

As more data are collected, it might someday be able to forecast a week or two out.

Right now, poppies are popping at the reserve in the western Mojave Desert.

It rained throughout the fall and into winter, and poppies need at least seven inches of rain to make a good showing, said Lori Wear, an interpreter at the reserve.

Snowfall in January seems to push them to another level, but that didn’t happen this season. So it’s a good bloom, but not extraordinary, she said.

Still, poppies — California’s state flower — blanket swaths of the protected land.

“It almost looks like Cheeto dust,” she said, “like somebody had Cheetos on their fingers and just smeared it on the landscape.”

Poppies here have typically peaked around mid-April, but variable weather in recent years has made it hard to predict, she said. Klosterman believes right now is likely the zenith.

Also blooming now: goldfields, purple grape soda lupine and owl’s clover. Wear described the latter, also purple, as looking like a “short owl with little eyes looking at you and a little beak.”

An SUV drives through blooms near the reserve. “It almost looks like … somebody had Cheetos on their fingers and just smeared it on the landscape,” said Lori Wear, an interpreter at the reserve.

(Kayla Bartkowski / Los Angeles Times)

On Sunday, Klosterman experienced the blooms for himself, using his technology as a guide.

It offers predictions in two forms. The first is the amount of the valley — shown in a satellite image — covered in poppies and goldfields, expressed as a percentage. The other is an overlay of orange and yellow splotches on the land.

The map showed a fairly high concentration of poppies near a stretch of Highway 138. He went there and, lo and behold, vibrant flowers awaited him. He sent proof: a smiling selfie in front of a sea of blossoms.

Klosterman’s tool may help answer arguably more complex questions than poppy or no poppy, such as a more precise understanding of the conditions the flowers need to thrive.

Experts know rain is key, but it’s more complicated than that.

Steve Klosterman takes a selfie in a field of California poppies.

(Steve Klosterman)

Heavy rain can supercharge invasive grasses, crowding out the blooms. Natives actually tend to do better after several years of drought, once invasives not adapted to the arid climate die out. That’s what led to an epic superbloom in 2017, Joan Dudney, an assistant professor of forest ecology at UC Santa Barbara, told The Times in 2024.

Klosterman wondered if the recent heatwave would desiccate them. But his model didn’t show that, and neither did his trip. So it’s possible other factors play a significant role in their persistence, such as length of day.

The model could also shed light on what could happen to the flowers as the climate warms. Will they migrate to the north? Will there be fewer blooms?

To game that out, Klosterman said you could invent and plug in a weather forecast with higher temperatures.

For now, Klosterman’s forecast is limited to the Antelope Valley. But if it expands to other areas, and other flower types, it could help people like Karina Silva.

Silva woke up at 5 a.m. last Wednesday to travel from her Las Vegas home to Death Valley National Park, hoping to beat the heat and the crowds to the superbloom.

But several hours later, she and her husband, David, were still trying to find it.

The hillside behind her was sprinkled with desert golds, but the display fell short of the riotous eruption of flowers posted on social media. The superbloom ended in early March, according to park officials.

“I was just thinking it was going to be this explosion of different colors,” Silva said by the side of the road overlooking Badwater Basin.