(AP) -- Rescuers confirmed one person died following a roof collapse at a mall in Northern Ontario but they believe there might be another person still alive beneath the rubble, officials said Monday.
Bill Needles, a spokesman from the Heavy Urban Search and Rescue team, said crews used a remote device called the life detector to determine a person was breathing as of 4 a.m. Monday morning, days after the Saturday afternoon collapse.
Needles said the location is the same where they heard some tapping in the rubble Sunday morning. But he said the area is unstable and rescuers had to retreat.
"There were signs of life," Needles said.
They are working on a finding safer way to the location and are shoring up the stability around the site, he said.
Needles said the person who died in another location is the same one whose hand and foot were visible in images captured by a remote camera. Needles said he doesn't have further information about the deceased because they haven't retrieved the body and they are focused on the other victim.
At least 22 people suffered minor injuries in Saturday afternoon's collapse at the Algo Centre Mall in Elliot Lake when a portion of the roof that serves as a parking area crumbled into an area near the food court. Workers used cranes to remove debris from the structure through the night.
Elliott Lake Mayor Rick Hamilton said they are continuing to treat it as a rescue effort and said they are continuing to search for victims.
Police compiled a list of people missing since the collapse Saturday, but the numbers continue to fluctuate. It was nine on Sunday but has since increased to more than 30 now.
Bianka Manning, a teacher from the local French high school, said she feared a former high school classmate may be trapped among the wreckage.
Manning said her friend worked at the mall's lottery kiosk, but she didn't know if she was inside the mall when the roof caved in. Manning and two of her students spent all of Sunday night sitting outside the mall wrapped in blankets, waiting for news.
Two kiosks selling lottery tickets, cigarettes and magazines were located in the area where the roof caved in and were open before the roof collapse, eyewitnesses said.
The collapse left behind a gaping hole which was 12 meters (39 feet) by 24 meters (79 feet). It also downed hydro lines and triggered a gas leak. Hamilton declared a state of emergency.