Woodstock cops expect hunt for bodies to take days

Police in Woodstock, Ont., want to hear from anyone who took pictures or video of an apartment building during a weekend explosion and fire.

Police say photos or videos might help investigators who are sifting through the wreckage in a search for two missing residents.

Woodstock police Const. Steven McEwan says officers could be working until next week to determine whether there are bodies in the charred rubble of the three-storey building.

Police say prospects look grim for two people missing since the Sunday morning blast. Five others who were previously unaccounted for have been found alive.

Authorities have yet to determine what caused the blast, but say there's no indication of criminal activity.

Investigators are looking into a natural gas service that powered appliances in the building as a possible cause.

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  Firefighters pour water on the scene of a three story apartment building fire in Woodstock, Ontario, Sunday, March 27, 2011. Seven people were taken to hospital and up to 11 more are unaccounted for, police said. (Dave Chidley / THE CANADIAN PRESS)

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  Firefighters pour water on the scene of a three story apartment building fire in Woodstock, Ont., Sunday, March 27, 2011. (Dave Chidley / THE CANADIAN PRESS)

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  The damage from an explosion at a Woodstock, Ont., apartment building is seen on Monday, March 28, 2011. (Tom Stefanac / CTV News)