Police are investigating the attack.
1,000 People Stopped About Missing Teen
Police officers have spoken to about 1,000 people as part of their efforts to find a missing teenager.
Scott Diver, 16, has been away from his home in Clydebank since Saturday September 17.
Police Scotland spoke to motorists and passers-by in three different areas of the town a week after he was last seen.
Officers questioned people near the youngster's home on Second Avenue, around Clydebank Shopping Centre and at the bus station on Chalmers Street.
The teenager, who was last seen by his father at home at about 2.45pm on September 17, is described as being white, 5ft 10in, and slim with dark coloured hair.
He was wearing a navy blue Adidas tracksuit with light strips on the arms and legs, a white T-shirt and navy blue Adidas trainers.
Inspector John Mullen said: "I would like to thank everyone we spoke to for their co-operation. We are looking through all the details gathered during the operation and will follow up any information gained from this.
"Scott's family are extremely distressed by his disappearance. I would again urge anyone who has any information on Scott's whereabouts, or any information that may assist this enquiry to contact the team at Clydebank Police Office through 101.''
Another girl was airlifted to hospital.
The attack happened on Waverley Bridge.
Opposition parties are criticising the figures.
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