ASHLAND, Va. -- Authorities believe the Washington-area sniper left a message with a telephone number at the scene of the latest shooting in Virginia, The Associated Press learned Sunday. Police appealed to the person who left the message to contact them.

"To the person who left us a message at the Ponderosa last night. You gave us a telephone number. We do want to talk to you. Call us at the number you provided. Thank you," Montgomery County, Md., police chief Charles Moose said in a televised briefing.

Moose made his cryptic statement as sniper task force investigators said they were working on the assumption that the sniper has expanded his geographic reach after shooting 11 people, nine fatally, in the Washington area since Oct. 2.

Surgeons succeeded Sunday night in removing the bullet from the 37-year-old man shot at the Ponderosa in Ashland, Va., on Saturday night, and turned it over to investigators for testing. Hospital spokeswoman Pam Lepley did not know the bullet's condition.

The victim remained in critical condition after three hours of surgery. Lepley said doctors were cautiously optimistic but expect the man will need more surgery.

Public schools closed

Public schools in the Ashland and Richmond area will be closed Monday, affecting more than 200,000 students, "based on the volume of parent and community concern," school officials announced late Sunday. After the earlier sniper slayings, schools restricted activities but did not close.

Moose refused to elaborate or take questions about the message left at the steakhouse or how it was left. But he asked the news media to "carry it clearly and carry it often."

After the briefing, Officer Joyce Utter, spokeswoman for Montgomery County police, said Moose's statement "should make complete sense" to the person who left the message.

"That is the only person Chief Moose wants to talk to," she said.

A law enforcement source close to the investigation said the person who left the message is probably the sniper who is responsible for the Washington area shootings.

Investigators who combed the area outside the Ponderosa finished their search Sunday but said little about what, if anything, they had found.

Some witnesses said they heard a shot coming from a wooded area near the restaurant, but nobody reported seeing the shooter.

If the shooting is linked to the sniper attacks, it would be the first weekend attack and the farthest the sniper has traveled -- about 85 miles south of Washington.

The longest previous distance from the Washington area was Spotsylvania County, about 50 miles south of Washington. It would also break the longest lull between shootings, about five days.

Former FBI profiler Clinton Van Zandt said Saturday's shooting, if related, could show the killer's approach is changing in response to law enforcement tactics. For instance, reports last week that military surveillance planes would be used in the Washington suburbs probably prompted the sniper to move farther away, he said.

And since much had been made about the weekend lulls, "I think he reacted to that," Van Zandt said.

The most recent confirmed sniper attack was the Monday night slaying of FBI analyst Linda Franklin outside a Home Depot store in Falls Church.Residents were on edge in Ashland, a town of about 6,500. At the Virginia Center Commons mall, about seven miles from the shooting, a normally busy food court sat half-empty Sunday. Shopper Nancy Elrod said she almost had been too afraid to come.

"We certainly felt sorry about all the people up north who were nervous and now it's down here and we're nervous too," said Elrod, 45.

Police said the victim, whose name was not released, and his wife were traveling and stopped in Ashland for gas and food. His wife told authorities the shot sounded like a car backfiring and said her husband took about three steps before collapsing.

Authorities were on the lookout early on for a white van with a ladder rack. Ashland Police Chief Frederic Pleasants Jr. said after interviewing witnesses, however, police had no suspects and no clear description of a vehicle that could be placed at the scene.

The victims underwent surgery for three hours Saturday night at MCV Hospitals in Richmond, hospital spokeswoman Pam Lepley said. Doctors said hey did not try to remove the bullet in the first round of surgery, but would try to do so in the second round.

Doctors had to remove part of the man's stomach, half of his pancreas and his spleen, said Dr. Rao Ivatury, the hospital's director of trauma and critical care. The man was conscious but unable to talk because he was on a ventilator, he said.

"The prognosis is still guarded, but since he is a very healthy man and he is very young, the chances are fair to good, I would say," Ivatury said.

Unless the bullet is removed, officials can't conclusively determine whether it was fired from the same rifle used in the 11 previous assaults.