Kimbrady Carriker appeared in Philadelphia County Municipal Court for arraignment on five counts of murder and other charges related to the rampage, which appeared to be random.

America has now endured 339 mass shootings so far this year, according to the Gun Violence Archive.

The husband of a heroic fourth grade teacher who was killed protecting her students during a massacre at a Texas elementary school has died of an apparent heart attack.

Jake Davison, who shot dead five people, killed himself after the six-minute shooting spree.

Adobe, PayPal, Apple and eBay are all based in the county, south of San Francisco, California.

The gunman is believed to be the boyfriend of one of the victims, police say.