The parents were worried that their 14-year-old son was hanging out with gang members and had called Loudoun County sheriff's deputies several times to complain about his friends.

But the tensions in the household did not diminish, and on Thursday, they exploded into public view as the 14-year-old and two friends barricaded themselves in the family's home, brandished a machete and held police at bay for four hours, authorities said yesterday. The teenagers refused to come out even when the 14-year-old's parents came home, they said.

The three teenagers -- ages 14, 15 and 18 -- now face criminal charges in the incident in Sterling, which began about 4 p.m. Thursday and ended when deputies stormed the home. Authorities said the 14-year-old is a known gang member. They would not release his name or the name of the gang.

"We believe he was doing this to gain notoriety, street [credibility] if you will, for himself,'' said Kraig Troxell, a spokesman for the Loudoun County Sheriff's Office.

The 18-year-old, Mubashar Javed of Annandale, is charged with trespassing and obstruction of justice. He is being held without bond at the Loudoun Adult Detention Center.

Javed's father, Saleem Javed, said yesterday that he was unaware of the charges and did not know whether his son is in a gang or associates with gang members. "He hasn't come home in two weeks, and we were really upset about it,'' Saleem Javed said.

Troxell said the incident began when a member of the department's community policing unit on routine patrol came upon a group of teenagers in the 200 block of North Sterling Boulevard. The teenagers started to run, but they stopped when told to do so by the deputy.

Troxell said that the officer "has had previous issues with this 14-year-old" and that the teenager's parents had called authorities several times to complain about his friends. "They didn't want his friends in their house,'' Troxell said.

As the deputy spoke with the group, the 14-year-old and the other two teenagers broke off from the group and ran into the 14-year-old's house. They barricaded the door, and one of the teenagers brandished a machete from inside. When the 14-year-old's parents arrived, they could not persuade the three teenagers to leave; neither could police negotiators who called the house, Troxell said.

At 7:45 p.m., the 15-year-old left on his own, Troxell said. A short time later, deputies forced their way into the home and arrested the other two without incident.

The 14-year-old is charged as a juvenile with obstruction of justice and possession of marijuana found in his pocket, the sheriff's department said. The 15-year-old, whose name was not released, faces charges of obstruction of justice and trespassing.