Six people were killed and one was seriously wounded in shootings at three locations in suburban Philadelphia, and a manhunt was underway for a suspect who knew the victims, authorities in Montgomery County said Monday.

One of the dead was the gunman's ex-wife, who was engaged to be married, and six of her family members.

The Montgomery County DA says Bradley William Stone is described as 5’10”, 195 pounds, Red/Auburn beard and mustache with closely cropped hair. Stone is known to use a cane or walker to assist him.