Police were attempting to arrest 24-year-old suspect on suspicion of stalking his ex-partner when he opened fire.

Authorities say 24-year-old Matthew Ruth fatally shot three Pennsylvania police officers and wounded two others on Sept. 17.

Three police officers were killed and two others were injured in York County after encountering a man who was suspected of stalking a former girlfriend.

Police were attempting to arrest 24-year-old suspect on suspicion of stalking his ex-partner when he opened fire.