EAST PALESTINE, Ohio (AP) 鈥 The crew operating a freight train that derailed in East Palestine, Ohio, didn't get much warning before dozens of cars went off the tracks, and there is no indication that crew members did anything wrong, federal investigators said Thursday as they released a preliminary report into the fiery wreck that prompted a toxic chemical release and an evacuation.

made his first visit to the crash site and took shots at former President Donald Trump, who had visited the day before and criticized the federal response to the train derailment. Their back-and-forth was the latest sign that the East Palestine wreck has become a hot-button political issue, prompting a rebuke from the head of the 春色直播 Transportation Safety Board.

鈥淓nough with the politics. I don鈥檛 understand why this has gotten so political,鈥 safety board Chair Jennifer Homendy, clearly exasperated, said at a briefing in Washington, D.C., on Thursday. 鈥淭his is a community that is suffering. This is not about politics. This is about addressing their needs, their concerns.鈥

The which laid out the facts that investigators have gathered to date, said crew members had no indication the train was in trouble until an alarm sounded just before it went off the tracks.

An engineer slowed and stopped the train after getting a 鈥渃ritical audible alarm message" that signaled an overheated axle, according to the report. The three-person crew then saw fire and smoke and alerted dispatch, the report said.

鈥淲e have no evidence that the crew did anything wrong,鈥 said Homendy, who announced a rare investigatory field hearing to be conducted in East Palestine this spring as officials seek to get to the bottom of the derailment's cause and build consensus on how to prevent similar wrecks.

Investigators said the temperature of the failed wheel bearing increased by 215 degrees in a span of 30 miles (48 kilometers), but did not reach the temperature threshold that railroad company Norfolk Southern had set for an alarm to go off until just before the wreck.

The train was going about 47 mph (75 kph), under the speed limit of 50 mph (80 kph), according to investigators.

Outside experts who looked at the report said the system appeared to work as designed, from the spacing of the hot bearing detectors along the tracks to the operation of the sensors.

鈥淭here鈥檚 nothing in the NTSB report that surprises me at all,鈥 said Dave Clarke, the former director of the Center for Transportation Research at the University of Tennessee. 鈥淚 can鈥檛 see anything to really criticize about what happened or how the response was made.鈥

Christopher Barkan, director of the Rail Transportation and Engineering Center at the University of Illinois, said the spacing of the sensors that recorded the temperatures of the Norfolk Southern train 鈥 10 and 20 miles (16 to 32 kilometers) apart 鈥 is common in the industry.

He said the detectors would not have notified the train crew of elevated bearing temperatures unless they met the threshold for action.

鈥淚 don鈥檛 see anything wrong here, but we just don鈥檛 know,鈥 Barkan said.

Homendy said investigators would look at whether industry safety standards 鈥 including high-temperature alarm thresholds and sensor spacing 鈥 will need to change to prevent similar derailments.

said the NTSB report showed the heat detectors worked as intended and the train crew operated 鈥渨ithin the company's rules." Nevertheless, the company said it would 鈥渘eed to learn as much as we can from this event鈥 and 鈥渄evelop practices and invest in technologies that could help prevent an incident like this in the future.鈥

The freight cars that derailed on the East Palestine outskirts, near the Pennsylvania state line, included 11 carrying hazardous materials. Villagers evacuated as fears grew about a potential explosion of smoldering wreckage.

Officials seeking to avoid an uncontrolled blast intentionally released and burned toxic vinyl chloride from five rail cars, sending flames and black smoke into the sky. That left people questioning the potential health effects even as authorities maintained they were doing their best to protect people.

In another sign of the environmental impact, the Ohio Department of Natural Resources said Thursday it now estimates spilled contaminants affecting several miles of streams killed nearly 44,000 fish, mostly small ones such as minnows. Its initial estimate was 3,500.

As NTSB released its preliminary findings, Buttigieg 鈥 who had been criticized for not coming to East Palestine earlier 鈥 went on a tour of the crash site and defended the Biden administration's response to the Feb. 3 derailment, which Trump had

Buttigieg told reporters that if the former president 鈥 and current Republican presidential candidate 鈥 felt strongly about increased rail safety efforts, 鈥渙ne thing he could do is express support for reversing the deregulation that happened on his watch.鈥

White House press secretary Karine Jean-Pierre excoriated 鈥減olitical stunts that we鈥檙e seeing from the other side鈥 but did not say whether a trip by Democratic President Joe Biden was in the works.

Another Biden administration official, U.S. Environmental Protection Agency Administrator Michael Regan, has been to East Palestine multiple times, most recently Tuesday as the to pay for the cleanup.

With heavy equipment rumbling behind him, Buttigieg slammed Norfolk Southern and other freight rail companies for fighting regulations he said would 鈥渉old them accountable and the other railroad companies accountable for their safety record." He pressed Congress to act.

Heather Bable, who lives two blocks from the derailment site, said she鈥檚 relieved the government鈥檚 top brass is finally showing up.

鈥淲e need that attention because we weren鈥檛 getting it. They should have been here all along,鈥 said Bable.

After throngs of residents lined the streets in pouring rain to welcome Trump on Wednesday, the reception for Buttigieg was decidedly more muted, with little fanfare around the village of just under 5,000 residents. Trump won nearly 72% of the vote in this heavily Republican region in 2020.

Democratic U.S. Rep. Chris Deluzio, whose Pennsylvania district borders the derailment site, asked Norfolk Southern to expand the boundaries of the geographic zone in which it is providing financial assistance and testing. He asserted the current zone excludes many affected Pennsylvania residents and businesses, and said the company should commit to cleaning up soil and water up to 30 miles (48 kilometers) beyond it.

鈥淣orfolk Southern is failing to show any commitment to rebuilding lost trust in our community,鈥 Deluzio wrote in a letter to Norfolk Southern's CEO. Providing additional resources 鈥渨ould help your company restore the sense of security that the Norfolk Southern train derailment and its aftermath destroyed.鈥

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Rubinkam reported from northeastern Pennsylvania and Mulvihill reported from Cherry Hill, New Jersey. Associated Press reporters Julie Carr Smyth and Patrick Orsagos in Columbus, Ohio, and Chris Megerian and Hope Yen in Washington, D.C., contributed to this report.

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