A Fairfax County man was arrested for allegedly having sex with a 14-year-old Montgomery County girl after meeting her online, Fairfax police said.

Police allege that StephannKamau, 23, of the 8300 block of Luce Court, had been chatting with the girl on MySpace for about a week before she agreed to meet him in person. On July 28, police say, he drove from his home in the Newington area, picked up the girl at her house about 2 a.m., and took her back to his house for sex.

The girl's mother woke up, realized her daughter was missing and called Montgomery police, Fairfax Officer Tawny Wright said. Later that morning, according to police, Kamau returned the girl home. On August 5, Fairfax police arrested Kamau and charged him with carnal knowledge of a child between 13 and 15 years old and use of a communication device to solicit a minor.