PITTSBURGH - Pittsburgh police say a man wearing a bulletproof vest opened fire on officers during a domestic disturbance call, killing three of them.
Police chief Nate Harper says the motive for Saturday's shooting isn't clear.
Friends say the gunman recently had been upset about losing his job and that he feared the Obama administration was poised to ban firearms.
Besides the three dead officers, a fourth was shot in the hand and a fifth officer broke his leg.
The gunman, 23-year-old Richard Poplawski, was arrested after a four-hour standoff.
