A man was shot overnight in McKeesport, and police say the shooting happened while he was trying to break into someone's apartment.

Allegheny County Police say that detectives from their Homicide Unit were called to McKeesport after a man was critically injured in a shooting.

Police say the incident started around 1:30 a.m. on Monday when an alleged domestic incident took place along Highland Avenue, and a woman told police her boyfriend assaulted her. 

"I heard people out here yelling, fighting," Daniel Adams of McKeesport said.

When officers arrived at the home to take the man into custody related to the alleged assault, police say he refused to leave the home. When officers forced entry into the home, the man fled through a back window, police said.

Police say the man then tried entering someone else's apartment by opening a window, and when he climbed through that window, he was shot by someone in the apartment.

"It sounded like a gunshot," Adams said.

The man who was shot was taken to the hospital in critical condition; Allegheny County Police detectives are now investigating.

It's unclear what charges the man who was shot may face stemming from the assault, or if the person who shot him will face any charges. 

A spokesperson for the Allegheny County Police Department says the case will be sent to the district attorney's office for review.