15 December 2014
Last updated at 22:45
Six people have been shot dead and three wounded in three locations near Philadelphia, officials in the US state of Pennsylvania say.
Montgomery County law enforcement are seeking the suspected gunman, who they named as Bradley William Stone, 35.
They say he may be armed and dangerous, telling residents to remain indoors.
The victims are all said to have a familial relationship to Mr Stone, who has been described as having red hair and wearing military fatigues.
He also reportedly uses a cane or a walking stick.
Authorities have identified the suspect as Bradley William Stone
The shootings in Harleysville, Lansdale and Souderton began at about 04:00 local time (09:00 GMT), according to local media reports.
One of the victims is believed to be a woman who was killed in her house.
Neighbours said they saw the suspect leave the house with two children, amid reports that the shooting may have been triggered by a custody dispute.
The children were reported to have been found safe a short distance away, says the BBC’s Barbara Plett-Usher in Washington.
Police officers later surrounded a home in Pennsburg, where the suspect is a resident.
Police used a megaphone to urge the suspect to surrender: “You’re under arrest!” and “Come out with your hands up!”
Shelter in place orders were issued for local schools.
“This a tragedy, this is a nice quiet town,” local resident Audrey Gallina told the Philadelphia Inquirer.