Fairfax County police yesterday shot and seriously injured a robbery suspect they were chasing as he leaped from a stolen pickup truck and pointed a shotgun at them on a busy street in Vienna, police said.

William Nabara, 19, of no fixed address, was listed in fair condition last night at Fairfax Hospital with four gunshot wounds to his abdomen.

Investigators said the shotgun was not loaded and had been stolen from an Oakton home an hour before the shooting.

None of the four police officers involved in the incident was injured in the shooting, which occurred shortly after 1 p.m. yesterday on Maple Avenue (Rte. 123) in Vienna as scores of people passed nearby on their way to and from lunch.

Gas station attendants and shopkeepers along the busy street watched as a pickup truck, pursued by four police cars, sped northbound on Rte. 123 into town.

Faced with a line of cars stopped at a traffic light, the driver plowed the truck into the rear of a 1971 Buick as police pulled up behind and alongside him, according to police and witnesses.

As police drew their weapons, the driver, wearing a pair of leather cowboy boots, kicked open the driver's side door, jumped out, pumped the 16-gauge shotgun and leveled it at the police officers, according to police.

Police behind and beside him responded by firing a number of shots -- witnesses said about five -- at the suspect, apparently shattering the truck's passenger side window and side mirror.

"He was asking for it, really," said Robert E. Smith, a Shell station mechanic who said he watched the incident. "I thought the guy wanted to die. It was like an execution."

The incident began about 12:45 p.m., when Fairfax police received a call from a 24-year-old Oakton woman.

According to police, the woman said a man and a woman later identified as Kathleen M. Dowd, 30, of the John Yancey Motel on Rte. 1, arrived about noon in a taxicab at a home in the 2800 block of Hunter Mill Road where the Oakton woman worked. The woman said the pair confronted her in the hallway, tied her up in the kitchen, stole money and ransacked the house, according to police.

Police said the woman freed herself but was captured again by the pair, who pointed a shotgun at her and tied her to a bed in the bedroom. The shotgun had been taken from the house, police said.

Police said the woman escaped again, jumped from the ground-floor bedroom window and ran to a gas station to telephone police.

Police said that when officers arrived at the house, they found Dowd walking down the driveway and arrested her. Just then, police said, a man drove by in a pickup truck that had been stolen from the home's driveway. The man was identified by the victim, and police issued a radio alert for the stolen truck.

Police spotted the truck on Hunter Mill Road and followed it to Rte. 123, where it headed north toward Vienna, police said.

By the time the pickup truck reached Vienna, four Fairfax County police cars were in pursuit, police said. Witnesses said the truck was traveling at a speed of at least 35 mph when it rear-ended the 1971 Buick in a congested commercial area on the Vienna town line just south of Nutley Street on Rte. 123. The front of the pickup, a late-model Chevrolet Silverado, was smashed. The driver of the Buick, 31-year-old John Hussey, was not injured, police said.

At that point, police said, the suspect jumped from the truck, pointed the shotgun and was shot by police.

Dowd was charged with abduction, robbery and burglary and was being held last night on $75,000 bond.

Nabara was charged with burglary, robbery, abduction, use of a firearm in commission of a felony and brandishing a gun. No bond had been set last night.

The four officers involved in the shooting have been placed on routine administrative leave pending completion of an internal police investigation.

Traffic was tied up along northbound Rte. 123 heading into Vienna for most of the afternoon as police cordoned off the scene of the shooting.