(CNN)Police have been in an hourslong standoff with a barricaded suspect who they say shot six officers on Wednesday in a North Philadelphia neighborhood.

Two officers are trapped inside the row house, Philadelphia Police Commissioner Richard Ross Jr. told reporters. He said he believed “they’re OK,” but declined to say more out of concern for their safety.
More than four hours after officers swarmed to the scene and the standoff began, negotiators are trying to to communicate with the shooter,