Weeks after a toxic train derailment carrying hazardous materials near the Ohio-Pennsylvania border that led to evacuations, authorities still say testing has not detected anything of concern.

Officials decided to do a controlled release of that gas, allowing it to burn to prevent an explosion. The burn caused toxic fumes to be released into the area, which alarmed residents about possible long-term effects after the explosion, including the occasionally strong odorous air they breathe and whether the water is safe to drink.

On Thursday, the US Environmental Protection Agency head traveled to East Palestine, Ohio, and told residents he vows to hold Norfolk Southern, the train company involved, accountable for its role in the derailment.

Meanwhile, Ohio officials caution the village of nearly 5,000 residents to drink bottled water and urge them to test private water wells while they evaluate the soil. No injuries have been reported.

And, at a town hall Wednesday night, East Palestine residents became angrier when  Mayor Trent Conaway told them they wouldn’t get an opportunity to question Norfolk Southern officials to learn more about the derailment after the rail company backed out.

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A caravan of national and local politicians and environmental officials converged Thursday in East Palestine attempting to restore the community’s trust following the train derailment.