Police in Portland, Ore., said a suspicious package that was destroyed by a local bomb squad turned out to be a school science project.

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Investigators said the box, which featured a wire and screws sticking out of it, was found Saturday at the Mittleman Jewish Community Center with a note reading: "Do not touch," KPTV, Portland, reported Monday.

The bomb squad blew up the box and police said they later learned it was a school science project that had been left at the center.

Portland Police Detective Mary Wheat said officers "can't be too careful," noting that two police officers were killed by a bomb at a Woodburn, Ore., bank two months ago.