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,

An officer was killed and multiple people were injured in a shooting reported at UPMC Memorial Hospital on Innovation Drive and Roosevelt Avenue in York County on Saturday afternoon. West York Borough Police say one of their officers has been killed.

Police responded to an active shooter incident at a hospital in York, Pennsylvania, on Saturday morning and there is no ongoing threat, officials said. The prolific character actor had over 267 film, television, and video game roles throughout his career.

UPMC announced this morning via a Facebook post that it has closed Memorial Hospital in West Manchester Township to visitors in the wake of a hostage incident Saturday that left one police officer dead, two injured and several staff members injured. The health care system did not say when visitors to patients would once again be welcome.

Four people are hospitalized and a gunman is dead after a shooting at the UPMC Hospital in York Saturday morning, according to the Associated Press.

"We know that families and visitors are vital to helping patients heal, and we are working toward making visitation possible again."

A memorial is growing as a Pennsylvania community mourns the loss of a police officer on Saturday. The officer was killed in the line of duty when a gunman opened fire inside the UPMC York Memorial Hospital.