A stolen sport-utility vehicle thought to be driven by a homicide suspect led police on a chase through the District and Prince George's County early yesterday that ended in a crash that slightly injured a Maryland state senator, authorities said.

No one else was hurt in the wreck, which occurred less than 12 hours after an officer chasing a drunken driving suspect crashed into a car in the District, critically injuring two occupants.

The events leading to the second crash began just before 8 a.m. as D.C. officers were watching a stolen Infiniti Q45 believed to have been used by a Connecticut murder suspect. When a man climbed behind the wheel of the car and started to drive away, officers tried to box in the car, but the driver escaped, police said.

Authorities chased the car through parts of Southeast Washington and onto Kenilworth Avenue, where the Infiniti's driver rammed a police car. The chase then continued into Fairmount Heights in Prince George's, where the car drove onto a vacant lot and apparently got stuck in mud, police said.

As officers on foot approached the Infiniti, the driver regained control of the car and drove at the officers, police said. One officer fired three shots at the car, missing its driver, police said.

The car then struck a Chevrolet Blazer driven by state Sen. Nathaniel Exum (D-Prince George's) before stopping in the 900 block of Eastern Avenue NE. Exum, who was slightly injured, was treated at a local hospital and released, police said.

Officers found the alleged driver of the Infiniti -- who, though a fugitive, was not the murder suspect -- nearby in the 900 block of Division Avenue NE, authorities said.

That man, Anthony R. Brown, 21, of the 300 block of N Street SW, was charged with assault, possession of marijuana, unauthorized use of a car and fleeing from police, authorities said.

Brown had been wanted on eight warrants charging him with several offenses, including failing to appear in court, leaving the scene of an accident and reckless driving.

Police were still seeking Charles W. Tucker Jr., 35, who is wanted on murder charges in Waterbury, Conn.

The other accident occurred about 11 p.m. Thursday when a Montgomery County police officer chased a drunken driving suspect into the District and hit a Toyota. The occupants of that car, identified by police as Patrick McCormick, 25, of the 400 block of Marietta Place NW, and Jessica Siciliano, 27, of the 3800 block of Greenly Street in Silver Spring, were hospitalized in critical condition, police said.

The drunken driving suspect, who tried to ram a police car, escaped, police said.

Police said the incident began in the 11700 block of Old Columbia Pike when a Montgomery officer tried to pull over a driver believed to be intoxicated.

The driver, who was driving a dark-colored Cadillac, tried to ram the officer's car and then drove away, police said.

The officer, Victor Valerio, chased the vehicle, a response permitted under the department's pursuit policy because the near-collision constituted an assault.

But as Valerio entered the District, police said, his supervisor called off the chase. One minute later, Valerio called the crash in on his police radio.

Montgomery police said they were trying to determine whether Valerio was still in pursuit of the Cadillac, which fled the scene, when he collided with the Toyota. The officer was put on paid administrative leave pending an investigation.