Six people have been shot dead and at least one other wounded in three locations near Philadelphia, officials in the US state of Pennsylvania say, the BBC reports.
Montgomery County police are seeking the suspected gunman, whom they named as Bradley William Stone, 35.
They say he may be armed and dangerous and told residents to remain indoors.
The suspect killed his ex-wife Nicole Stone, her mother, her grandmother, her sister, her sister’s husband and 14-year old daughter.
Mr Stone was described as having red hair and wearing military fatigues. He reportedly uses a cane or a walking stick.