Four people were killed yesterday in two separate traffic accidents in the Washington area.

Three people died shortly after noon in a crash on Route 1 in the Woodbridge area, Prince William County police reported. Officers said rain apparently contributed to the accident, which they said occurred near Crest Drive when a car lost control and veered into oncoming traffic. As many as six vehicles were involved in what became a chain reaction, police said.

At least one other person was injured in the crash and was reported in critical condition yesterday at Washington Hospital Center. The victims' names were not released pending notification of relatives.

Early yesterday, an unidentified man was killed while fleeing U.S. Park Police when the stolen Jeep he was driving struck a tree in Southeast Washington and caught fire, according to police.

The driver, described as in his twenties, allegedly had been involved in several hit-and-run accidents in the Jeep before the chase began at Stanton Road and Savannah Street SE, shortly before 5 a.m., police said.

The Jeep struck a tree in the 2300 block of Martin Luther King Jr. Avenue SE minutes later and burst into flames so quickly that the pursuing officer was unable to free the trapped suspect, police said.