Baltimore County police took a person into custody Friday afternoon after a reported assault and attempted carjacking.According to preliminary information from police, officers were called around 3 p.m. to Old Court and Greenwood roads in the Lochearn area for an assault in progress.Police said the assailant ran away when officers arrived and tried to steal an occupied vehicle nearby, at which point, the assailant was taken into custody.An officer suffered minor injuries and was treated at the scene, police said.This report will be updated.