Washington - Police in Washington have arrested five people they say opened fire on fellow police officers.No injuries were reported early on Tuesday.The latest incident follows protests over police killing black men in Louisiana and Minnesota and the fatal shooting of five police officers in Dallas last week.Police spokesperson Dustin Sternbeck said that officers had responded to gunshots in southeast Washington. When they arrived in marked police cruisers, people inside a SUV began shooting at them. Sternbeck says police returned fire at the suspects, who barricaded themselves in the vehicle.Police ordered the people to leave the vehicle, but they refused. After about 30 minutes, three women and two men in the SUV surrendered.Sternbeck says it's not clear why they had fired on officers. The investigation will include whether they were involved in other crimes before police arrived.