A precious metals dealer was robbed of a roller bag containing some 80 million yen ($744,000) in cash Saturday after being assaulted by three men on a street near Tokyo's Roppongi district, police said.

The 27-year-old man sustained minor injuries after he was attacked from behind around 1:55 p.m. in an area dotted with apartment and other buildings, about 500 meters north of the Roppongi subway station, the police said.

The search is continuing for the three suspects, they said.

The victim, along with his 29-year-old superior, were headed on foot for a purchase of precious metals, near the crime scene, the police said.

He called police by himself after being beaten on the head and face, they added.