A high-speed police chase in which two officers were struck by a car running a roadblock and other officers fired a half dozen shots, ended in the arrest Tuesday night of a 24-year-old Prince George's County man on multiple charges of assault with intent to murder, Montgomery County police reported.

Floyd Alchester Washington Jr. of 9406 Queen's Way, Upper Marlboro, was arrested after he drove through a police roadblock on Columbia Pike in Silver Spring set up to stop a car reportedly driving south in the northbound lanes of the road, police said. Minutes later, Washington's car was forced over by a cruiser near Northwest Drive at the end of what police said was a four-mile chase.

In addition to five assault charges, Washington was booked on numerous traffic violations. He was being held yesterday at the Montgomery County jail in lieu of $5,000 bond.

Police said State Trooper J.D. Masci first saw a car driving the wrong way on Columbia Pike near Fairland Road and chased it. Unable to stop the car, he asked State Police to call in Montgomery officers to set up a roadblock at Columbia Pike and Stewart Lane, police said.

The driver slowed at the roadblock, then accelerated, striking two officers as he passed through, police said. None was seriously injured. Officers fired up to a half dozen shots at Washington's car, but did not hit him, police said.