MARSEILLES, Nov 18 (Reuters) - A teacher at a Jewish school in the southern French city of Marseilles was stabbed on Wednesday by three people professing support for Islamic State, but his life was not in danger, prosecutors said.

Three people on two scooters, one of them wearing an Islamic State t-shirt, approached the teacher in the street, Marseilles prosecutor Brice Robin told Reuters.

Another showed a picture on his mobile telephone of Mohamed Merah, a homegrown Islamist militant who killed seven people in a series of attacks in southern France in 2012.

"The three people insulted, threatened and then stabbed their victim in the arm and leg. They were interrupted by the arrival of a car and fled," Robin added. (Reporting by Francois Revilla; writing by Leigh Thomas; Editing by Kevin Liffey)

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