Prince George’s County police said a county officer has been involved in a collision with a school bus. The collision happened on Pennsylvania Avenue at Silver Hill Road, police said. The officer was supposedly responding to a call about shots fired in the area and was traveling with lights and sirens on when the crash happened, police said. Officials said 29 students from the Braddock Heights Elementary School and four adults were on the bus. The students were being rewarded for reading. Officials said they were on a field trip to the Prince George’s Stadium to see the Bowie Baysox. Authorities said there are about a dozen minor injuries on the bus and the students were taken to four hospitals. The officer also suffered minor injuries, police said.