What were the four police officers doing when a gunman came in?

News Item 3
    Four uniformed police officers in the American state of Washington have been shot dead at a cafe in what was described as a targeted attack. (9) The four officers were working on their laptop computers at the cafe in the city of Tacoma when one gunman came in, fired multiple shots at them and left. Ed Troyer is a spokesman for the Pierce County Sheriffs Department. " None of the briefs said the coffee employees or any of the people that were inside the store Were targeted, or hit, or wounded. So we believe this is a cold, calculated killing. "
    The four policemen were pronounced dead at the coffee shop, which is next to the McChord Air Force Base. The scene of the attack was cordoned off, and roads in the area have been blocked. (10) The suspect is described as a black male who was dressed in a dark dirty coat.