homicide investigators say officer steven glickman chased him and fired when the youth made may gesture like he was pull a gun from his jacket. he did not know that the youth was 14 and that the shooting was justified under the circumstances of a check of records dis close the boy was arrested six tiles in past two years for the theft of buss or other muni property. muni security officials say it's an old problem, buses can't be locked and no keys needed to start them. >> i don't think there is a mass transit bus in the united states that can be locked with an ignition key. they are started by pushing a button that is located on the dash. >> it's not quite that simple, but people have figured out how to start and drive them. the 14-year-old who took this one joyriding yesterday, knew how. >> he has stolen muni buses in the past on several occasions. he was well-known in the muni yard bit workers there. apparently part of his probation was to do community work at the muni yard. >> to me that is like taking an embezzler and putting him or her in the puc finance bureau or working in a bank