The future of a Montana animal shelter remains uncertain after a cloud of smoke from two pounds of methamphetamine seized by the FBI and incinerated filled up the building and sent workers to the hospital.

The smoke started to fill the building of the nonprofit Yellowstone Valley Animal Shelter in Billings on Wednesday while the FBI used an incinerator at the animal shelter to burn the drugs, city officials said.

Assistant City Administrator Kevin Iffland said Friday that the smoke was sucked in apparently because of negative pressure. A fan was supposed to be on hand in such situations to reverse the pressure so smoke would flow out of the building, but it wasn't readily available.

The incinerator is used primarily to burn carcasses of animals euthanized or collected by the city's anim

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