Two boys, one 11 and the other 14, were arrested Sunday after an attempt was made to rob a woman at knifepoint in a store parking lot, authorities said.

The robbery attempt, which occurred in Anne Arundel County, was one of three incidents in the Washington region in recent days in which young children have been implicated in crimes.

In the Sunday incident, which occurred in the Glen Burnie section of Anne Arundel, a 34-year-old woman told police that two boys approached her in the parking lot of a Wal-Mart in the 6700 block of Chesapeake Center Drive.

One showed a knife and ordered her to drop her packages, the police said.

Instead, the woman kept walking, and the would-be robbers fled, police said. The boys were later found and arrested, and a knife was seized, police said. The two were charged as juveniles with armed robbery.

In another incident, two boys who were 12 and 13 were charged as juveniles with the sexual assault and abduction of an 11-year-old girl in Prince William County.

Police said the girl told officers that she had been held down in her back yard in Woodbridge and assaulted.

The assault occurred Wednesday, but police did not announce it until Monday.

In the third incident, a robbery victim in the District told police that the offense was carried out by two boys who appeared to be 13 to 15 and two girls who appeared to be 12 to 15. The incident Sunday occurred in the 3000 block of Stanton Road.