A Fairfax County man was charged last week with having sex with an 11-year-old Rockville girl he met via the Internet after the girl's mother found him at 3 a.m. hiding in the child's bedroom closet, authorities said yesterday.

Vladimir Chacon-Bonilla, 22, of the 6900 block of Westhampton Drive in the Alexandria area, was arrested Friday morning after the girl's mother went to check on her daughter, smelled cigarette smoke and alcohol in her room and discovered the suspect in the closet with his pants down, Montgomery County police said.

He was charged with one count each of second-degree rape, second-degree sex offense and third-degree sex offense, John McLane, a spokesman for the Montgomery County state's attorney, said yesterday. Chacon-Bonilla was released on $10,000 bond after a hearing Monday and was told to have no contact with the victim.

A preliminary hearing was scheduled for Aug. 20.

According to a search warrant affidavit filed by Fairfax police, the girl met Chacon-Bonilla in Internet chat rooms, where he used the screen names DEDONDESON and YUVI2000, and that led to an in-person meeting in May at Wheaton Plaza.

On May 17, they engaged in sex at an undisclosed location, according to the affidavit, and had several subsequent sexual encounters, including Friday.

A woman who identified herself as the suspect's mother declined to comment when contacted by phone yesterday. She said her son was not available.

Chacon-Bonilla admitted to having sexual contact with the girl, according to a police statement of probable cause filed in Montgomery County District Court, but he said he knew her on the Internet as Alexia and believed she was 17. The girl said she let him into her house through a rear door, according to the statement. The Washington Post generally does not identify the victims of alleged sex offenses.

The incident was the latest in a string of local cases in which people have been charged with soliciting sex from minors over the Internet or engaging in sex with minors they met on the Internet.