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A suspected gunman in a series of deadly shootings in Pennsylvania has been captured alive in neighbouring New Jersey, US police said.

The police said the suspect shot three people dead in Levittown on Saturday before fleeing across state lines to the home in nearby Trenton.

Residents were home when the suspect entered the house but they were later safely evacuated, police added.

Police said Andre Gordon surrendered peacefully and unharmed to officers.

The 26-year-old suspect, who was known to the victims, had barricaded himself inside a home before turning himself in to police. The Trenton police said he had left the house and had been spotted by police nearby.

The suspect is thought to be homeless, but primarily stays in the Trenton area, according to Philadelphia police.

Earlier, Bucks County District Attorney Jennifer Schorn told a news conference people related to Mr Gordon were among the victims in Levittown, including a child. Levittown is part of the Philadelphia metropolitan area.

Mr Gordon allegedly shot and killed his 52-year-old stepmother, Karen Gordon, as well as his 13-year-old sister, Kera Gordon, after breaking into a house in Levittown.

Shortly after, officials say, he broke into another home about two miles away, where he allegedly shot and killed the mother of his children, 25-year-old Taylor Daniel.

He allegedly also bludgeoned her mother with the butt of his rifle, and she is now recovering in hospital.

The Bucks County DA's Office said following the shootings, Mr Gordon allegedly carjacked an individual at a dollar store before making his way to the home in Trenton, where he barricaded himself.

Images captured the police response to the siege in Trenton, and appeared to show hostages climbing out a first floor window before being cared for by police.

The weapon used by Mr Gordon is believed to be an AR-15-style assault rifle, officials told the news conference.