Three teenagers have been arrested in Essex after an object was dropped on to a car.
It happened just before 6.30 on Sunday evening when a car was passing under White Hart Lane Bridge on the A138 in Chelmsford.
The woman driver was badly shaken but unhurt. A 14-year-old boy from Chelmsford has been released on police bail until the end of the month. Another boy and a girl were released without charge.