Updated at 10:30 p.m. Aug. 14.
At least six police officers were wounded Wednesday in what authorities said remained an "active and ongoing" shooting situation near Temple University in Philadelphia.
Philadelphia Police Commissioner Richard Ross said all six had injuries that were not life threatening and "everybody is going to be OK."
Two police officers who were trapped in the house with the gunmen for more than four hours were safely evacuated. But the gunman remained barricaded and continued to trade gunfire with the police outside.
Live video from news stations shows a massive police presence in the city's Nicetown neighborhood.
Police were trying to communicate with the shooter.
"We are trying to talk to this male, trying to let him know that he can end this peacefully now," Ross said.
He said they called the shooter multiple times, that he picked up, but did not speak.
Police said the shootout began when an officer attempted to serve a warrant at the address.
The shooting prompted a lockdown at the Temple University Health Sciences Center Campus. The university issued a warning via Twitter:
The White House said the president "has been briefed on the shooting in Philadelphia and continues to monitor the situation."