A shooting at a Chicago hospital on Saturday morning has left a police officer dead and another critically injured, according to NBC 5 Chicago.

The suspect, who has not been publicly identified, is in custody, according to Andre Vasquez, alderperson for the city’s 40th ward.

The individual had already been in police custody when they were transported to Endeavor Health Swedish hospital’s emergency department for treatment, the hospital said in a social media post.

“In accordance with Endeavor Health public safety weapon detection protocols, this individual was wanded upon arrival,” the hospital wrote.

The suspect opened fire on officers before exiting the building. He was later apprehended, according to the hospital.

Endeavor Health’s medical campus remains on lockdown amid the ongoing investigation.

One officer was shot in the head, according to NBC News.

“This is a horrible situation all around,” Gilbert Villegas, alderman for Chicago’s 36th ward, posted on social media. “Thank you to CPD for the quick response and swift action. Sending my thoughts and prayers … ”

More details soon …