Officers were contacted just before 2pm on Thursday March 10, with reports of something being thrown from a bridge over the A120 between Braintree and Dunmow. A rock, believed to be a piece of brick, was thrown off the bridge at Station Road, Felsted, and hit the windscreen of a white tipper truck travelling towards Braintree. The suspect is described as wearing a dark hooded top and was standing on the bridge with one other person. The tipper truck was being driven by a 59-year-old man from Braintree. Anyone with information is asked to contact police at Dunmow on 0300 333 4444.