By MATTHEW BROWN

BILLINGS, Mont. (AP) — A cloud of smoke from two pounds of methamphetamine seized by the FBI and incinerated inside a Montana animal shelter prompted its evacuation and sent workers to the hospital, city officials in Billings said.

The smoke started to fill the building during a drug burn on Wednesday, apparently because of negative pressure that sucked it back inside, Billings Assistant City Administrator Kevin Iffland said Friday. A fan was supposed to be on hand in such situations to reverse the pressure so smoke would flow out of the building, but Iffland said it wasn’t readily available.

The incinerator is used primarily to burn the carcasses of animals euthanized or collected by the city’s animal control division. But every couple of months local law enforcement

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