this is anthony chan chez. he was -- sanchez. we were hoping to show you a picture. investigators say he drove away while an officer was doing paper work. police found the van but no sign of sanchez. >>> muni officials were on the street where a cable car made a sudden stop. ktvu's david stevenson is in san francisco and tells us a censor system failed to prevent the accident, david? >> reporter: that's right. powell street cable car line, today we learned new details about the accident and why an alarm didn't warn operators. >> reporter: powell street, a cable car ride, a day after the accident. one passenger was ejected and two injured. when it came to a sudden stop near washington street wednesday morning. >> the cause of the incident was a loose bolt. >> reporter: they say this bolt vibrated loose from a plate and became jammed. car 25 hit it at 9 miles per hour. and slammed to a stop. censors are supposed to alert authorities about obstructions, giving them time to shut down the system. authorities say the alarms are sensitive enough to detect paper and go off 2