Images show concrete block damage
The full effects of the impact of a "bucket-sized" block of concrete dropped on to a car from a bridge have been shown for the first time.
Police released images of the Nissan car being driven by a 57-year-old woman that was badly smashed when the block was thrown from a bridge on Thursday evening.
The woman suffered fractures to her face and ribs as well as internal injuries when the cylindrical-shaped block burst through the windscreen, coming to a rest in the footwell.
Pictures show the interior of the car covered in tiny pieces of broken glass and the roof bearing a large dent on the passenger side.
The incident happened at 10.05pm on Thursday night as the car passed under West Hanningfield Bridge near Galleywood, Essex, on the A12 from Chelmsford to London.
The woman, who is in a stable condition at Broomfield Hospital in Essex, was in the car with her husband, the driver, who suffered minor cuts and bruises.
Police said the 56-year-old man is at his wife's bedside. The couple were returning to their home in Harold Hill, east London, after visiting friends.
A similar incident occurred 40 minutes earlier under Fryerning Lane Bridge near Ingatestone when a Vauxhall Astra had its windscreen smashed.
The occupants, a mother and daughter aged 48 and 26, from Brentwood, escaped unharmed. They were driving to Chelmsford after a day's Christmas shopping at Lakeside Shopping Centre, when the block struck.
Police, who are treating the incident as attempted murder, said they were releasing the photographs to "demonstrate the damage and potentially fatal consequences of these mindless acts".