Twelve-year old William E. (Billy) Viscidi ate breakfast Tuesday morning, then "just walked down the drive-way, took a left and headed toward Nutley," his brother Larry recalled yesterday, pointing to Nutley Road, a main street that cuts through Vienna toward Interstate Rte. 66.

Billy, who was barefoot and wearing a red tank top and cutoff blue jeans, hasn't been seen since despite a search started Tuesday night that yesterday included more than 100 volunteers and members of the Fairfax County and Vienna police and fire departments and local radio clubs.

"All we can do is wait and hope somebody calls or something," said Burton Viscidi, Billy's father, who cut short his stay in a hospital where he was recovering from kidney stone removal Wednesday to return home to 503 Princeton Ter. SW, Vienna. Viscidi, a broadcast technician for the Voice of America, was standing in his front lawn as his two older boys sat listening and his youngest son rode his bike up and down the sidewalk.

Larry Viscidi, 14, said that Billy had not seemed depressed about anything, and he did not think his going for a walk was unusual. Billy's only friend in the neighbourhood has been on vacation with his parents for the past weeks so Billy wouldn't have been going to anyone's house, his father said.

"Billy had few friends - he was a quiet kid," Burton Viscidi said. "I guess you could say he kept to himself. He was, kind of small for his age."

When Billy's mother, I. Grace Viscidi, returned home from her job as a computer programmer for the CIA about 7 p.m. Tuesday and learned that Billy had not been around since breakfast, she made a quick search of the neighbourhood, then called Vienna police, who began the search.

Billy always came home on time for lunch and supper, Grace Viscidi said.

The four incoming lines on the Vienna town police force's telephones were in use almost continously yesterday with possible leads from people who thought they had seen a boy fitting Billy's description: 4 feet 6 inches tall, weighing 72 pounds with shoulder-length brown hair and brown eyes.

"As time goes on there is more and more indication that there may have been foul play," said Sgt. Joe Tavares, who is leading the investigaiton for the Vienna police. "We've called in some tracking dogs from Stafford County."

So far police have concentrated the search in the southwest section of Vienna where Billy lives, Tavares said.

The boy's father said yesterday that Billy, who is scheduled to enter the eighth grade at Luther-Jackson Intermediate School this fall, is a "bright, very intelligent boy." Billy would never accept a ride from a stranger or decide to hitchhike somewhere, his father said. "We always warned him about things like that and he understood pretty well," he said.