A 31-YEAR-OLD West African man was attacked by a bus driver and eight other men after the driver locked him in a parked bus, police were told.

The driver summoned the men on his mobile phone.

They arrived shortly after in two cars, boarded the bus and kicked and punched the man, he said in a statement to police.

Senior Constable Renee Hulls from Sunshine police has confirmed police are investigating an attack on a man on a bus at Sunshine station on Thursday night.

Musu Morris, 24, a care aid worker from Sunshine who witnessed the attack, said eight men were involved: ''One was a huge fat boy, and he hit him a blow and another blow. I felt very bad. I couldn't do anything. I tried to hold one. They just shoved me off,'' she said.