Salem Police said they are investigating three residential burglaries that took place over the weekend where "large amounts of copper piping" were stolen.

Police said Monday morning that all of the homes "appeared to be unoccupied, under construction, or for sale."

Suspects in the buglaries gained entry through basement windows or, in one case, police said they kicked in a front door.

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Police described the suspect vehicle as a white Ford van with no lettering and a possible Massachusetts registration.

Witnesses described the suspects as a heavy-set white male in is 50s or 60s with a grayish beard and a white female possibly in her 30s.

Police said they have no other information at this time. Salem detectives are investigating the case.

Anyone who has seen anything or sees anything suspicious especially near unoccupied homes are asked to contact police at 893-1911.