Three police officers were shot dead and two wounded on Wednesday in southern Pennsylvania in the United States before the attacker was shot down, authorities said.

It was one of the deadliest days for police, not only in Pennsylvania, but in the US, in recent times.

Here is what we know:

What happened in Pennsylvania?

The shooting took place a little after 2pm (18:00 GMT) on Wednesday at a farmhouse off a quiet country road a couple of miles outside an old mill town.

Police said the officers were there to serve a warrant. At a news conference, Christopher Paris, the state police commissioner, explained that they were following up on an investigation that began the day before, but he shared few other details.

“The general heading of that investigation, I would say, would be domesti

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