A railway worker suffered injuries to his face when an object was thrown from a road in Devon.
The man was working near Teignmouth station when the object, thought to be a stone, was thrown from about 14m (45.93ft) above the railway line.
The man's colleagues said they had heard a group of youths prior to the object being thrown at about 0030 BST on 8 August.
Anyone with information is urged to contact British Transport Police.
PC Alan Freeman said: "This was an unprovoked attack. Had the worker been struck directly in the face, the injuries could have been much worse."