Several motorists were lucky not to be killed or seriously injured, police say, when large lumps of concrete were dropped from an overpass above a key Melbourne arterial road.
About 3.30am on Wednesday, police were called to a pedestrian footbridge over the Western Ring Road, between Widford Street and Sydney Road, in Glenroy after reports someone was throwing objects from it.
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A police spokesman said that four vehicles were damaged, including one truck, where the windscreen was so severely damaged it had to be replaced on the side of the road before the driver could continue.
The concrete was heaved off the overpass onto the city-bound lanes. Traffic management crews had to remove the concrete to prevent damage to other cars.
There are reports that two other cars and an Australia Post truck were damaged, but police could not confirm this.
In 1994, a Melbourne academic was killed when two teenagers hurled a 1.8 kilogram rock off the Yarra Bend overpass onto the Eastern Freeway. The rock went through his windscreen, hit his chest and ruptured his heart.
Police believe each of the chunks of concrete hurled off the overpass weighed between 10 and 15 kilograms. It is unclear how many were thrown.
Craigieburn police are investigating and are searching for those responsible.
Anyone with information is asked to phone Crime Stoppers on 1800 333 000.