OSAKA – A Nepalese man died Monday after being assaulted on a street in Osaka early Monday by two men and two women, police said Tuesday.

Bishnu Prasad Dhamala, 42, died at a hospital after being attacked Abeno Ward.

The police said they arrested Hiroki Shiraishi, 21, a tattoo artist, and his acquaintance, Miyoko Shiraishi, 22, at the scene after receiving a report about the assault.

The police are looking into the whereabouts of the other two assailants.

The four and Dhamala are not believed to be acquainted and the police are trying to identify the cause of the incident.

Dhamala came to Japan about 10 years ago and had been working at a restaurant in the city, according to the police.