Police in Langley, B.C., have released the names of two victims of the mushroom farm tragedy that killed three farm workers Friday.

Ut Tran, 35, from Surrey, B.C., is one of the men who died. Michael Phan, also 35, is still in critical condition in hospital.

Three men died at Farmers Fresh Mushrooms in Langley in a confined space after being overcome by noxious fumes late Friday.

Initial reports from Worksafe B.C. suggest the men were mixing manure into compost when a pump broke and the three were overcome by a mixture of gypsum, water and chicken manure.

Three others were also overcome trying to help their co-workers. Two are in hospital in critical condition, the third is stable.

The head of B.C.'s largest labour organization is calling for an inquiry into the deaths.

"We need some answers here so something like this doesn't happen again," B.C. Federation of Labour head Jim Sinclair told CTV News.

Workers at the farm are stunned by the accident, saying the victims were doing a task they'd completed hundreds of times before.

"They were making the compost for the mushrooms," a worker named Mariwan told CTV. "So they mix it up with the chemical."

Dozens of firefighters and emergency officials were at the scene, putting unconscious bodies onto stretchers and carrying them into a covered warehouse for decontamination.

The RCMP said the incident does not appear to be criminal. WorkSafeBC and the B.C. Coroner's Office are investigating.

The owner of Farmers Fresh Mushrooms has not answered questions from media but his wife, Vanessa Truong, says she doesn't know what happened.

According to their website, the company has been operating since 1999 and makes more than $20 million annually in sales.

The Township of Langley is about 40 kilometres southeast of Vancouver.