A man accused of stalking his ex-girlfriend hid inside her York County, Pennsylvania, farmhouse and then ambushed five police officers, killing three, who were there to arrest him on Wednesday, according to the county's district attorney.

The ambush-style shooting happened shortly after 2 p.m. Wednesday at a farmhouse in North Codorus Township while police were attempting to arrest the suspect, 24-year-old Matthew James Ruth, York County District Attorney Tim Barker said.

Police arrived at the home around 2:10 p.m. Wednesday and noticed the front door was unlocked even though the ex-girlfriend and her mother had locked it before leaving for their safety.

"Make no mistake about it, and this I can conclude by all reasonable inferences by all information without speculation," Barker s

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