Three teenage Birmingham pupils made a citizen's arrest on an armed robber trying to steal equipment from their school.
The sixth formers, all aged 17, gave chase after the screwdriver-wielding man was interrupted by teachers as he tried to steal a computer projector from Small Heath School and Sixth Form Centre in Small Heath.
They cornered him on Coventry Road near to the school and held on until police arrested him.
The thief entered the school at 3.45pm yesterday pretending to be a workman.
School senior tutor Richard Riley said: "He hit one of them two or three times but they held on to him."