UPMC released a statement on social media saying the hospital is "now secure" and that law enforcement is managing the situation.

Officials are investigating a possible motive that led to a man entering the UPMC Memorial Hospital ICU where several staff members were shot and taken hostage on Saturday. ABC News reports that Diogenes Archangel-Ortiz,

The man who authorities say entered a Pennsylvania hospital with zip ties and a pistol over the weekend had recent contact with the hospital's intensive care unit, where he took staff members hostage and was killed in a shootout that left a police officer dead and others injured.

A gunman, armed with a handgun and carrying zip ties, went inside UPMC's ICU, and took staffers hostage before he was ultimately killed by police in a shootout, the York County DA said.