Passengers watched in horror as a bus driver was punched in the face by an unknown attacker in Lancing.
The Stagecoach driver was hit around the head as he sat at the wheel at 10.50pm on Saturday.
The incident happened near the Manor roundabout on the A27.
The driver sustained minor head injuries and was taken by ambulance to Worthing Hospital.
No one from Stagecoach was available for comment this morning.
Police have appealed for witnesses to contact them on 0845 6070999.
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