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26 January 2012, 11:10 | Updated: 26 January 2012, 11:14
A driver's had a lucky escape after an object was thrown off a bridge over the M25 in Hertfordshire, smashing his windscreen.
Police now say they want to speak to three children seen waving on the bridge as the lorry approached eastbound at 3.15pm on Saturday 21 January 2012.
Moments later, the object was thrown from the Ovaline Farm bridge between Junctions 20 and 21 near Hemel Hempstead.
The three children were described as being white, aged between 11 and 12 years old, two of them were wearing grey tracksuits, the other was wearing a dark blue tracksuit. The driver was uninjured.
PC Owen Nee from the Bedfordshire and Hertfordshire Roads Policing Unit is investigating and said "Incidents such as these can have extremely serious consequences but thankfully in this case the lorry driver was not injured.
"I would like to speak with the children who were on the bridge. We believe two of the children in the group were not directly involved in what happened. If anyone knows who they are or who saw what happened I would ask that you contact police.”
Anyone with information is asked to contact PC Nee via the Herts Police non-emergency number 101.