A fire in a dormitory at a Mexican immigration detention centre near the US border left more than three dozen migrants dead, a government agency said Tuesday, in one of the deadliest incidents ever at an immigration lockup in the country.

Hours after the fire broke out late on Monday, rows of bodies were laid out under shimmery silver sheets outside the facility in Ciudad Juarez, across from El Paso, Texas. Ambulances, firefighters and vans from the morgue swarmed the scene.

Forty people died and 29 were injured and are in “delicate-serious” condition, according to the National Immigration Institute.

There were 68 men from Central and South America held in the facility at the time of the fire, the agency said.

It was the deadliest incident inside a Mexican immigration facility in recent memory. Authorities are investigating the cause of the fire and the governmental National Human Rights Commission had been called in to help the migrants. The agency said that it “energetically rejects the actions that led to this tragedy” without any further explanation of what those actions might have been.

The country’s immigration lockups have seen protests and riots from time to time.

Mostly Venezuelan migrants rioted inside an immigration centre in Tijuana in October that had to be controlled by police and National Guard troops. In November, dozens of migrants rioted in Mexico’s largest detention centre in Tapachula near the border with Guatemala.

AP/PTI