This story will be updated.
Police are asking those in downtown Saco to shelter-in-place this afternoon due to an "ongoing incident" in the area.
Chief Jack Clements told WGME that just before noon, police received reports of shots fired between two cars at the intersection of Elm and Temple Streets. Soon after, there was a traffic collision nearby, and he says four males fled from a vehicle.
Clements said the incidents are related, and officials are still looking for the four men.
He said that local, state, county, and federal resources are involved in the search.
For a time, students at Thornton Academy weren't permitted to leave campus. The school allowed students to be dismissed late this afternoon, with police escorting students to busses.
Police say they'll share more information as it becomes available.