Less than a week after 20-year-old Chris Currie was killed when a concrete block was dropped from an overbridge onto his car, a second missile has been thrown at a moving vehicle.

A woman passenger was knocked unconscious by a rock which was hurled through the window of the bus she was on in Mt Albert, Auckland, at about 9.30 last night.

Inspector Darroch Todd says the woman escaped with minor injuries, but it could have been much worse. He says it is an appalling incident which defies belief in light of Mr Currie's death.

Inspector Todd says the offender was seen running away and could only be described as a dark shadow. He says anyone who can identify the person should contact police.

Around a thousand people attended Mr Currie's funeral in Taupo yesterday. A 14-year-old boy has been charged with murder.