A lone gunman shot and wounded three men Friday in a residential area near Tokyo and then took refuge in a building, officials say, AP reported.
Police were negotiating with the gunman in Yokohama, police spokesman Shigeki Umehara said.
He said one of the three wounded men was in critical condition and the other two had light injuries.
Media reports said the shooting appeared to be gangster-related, and TV footage showed police surrounding a building.
The shooting took place in a residential area in Yokohama, south of Tokyo, according to Ken Koide, a city fire department official.
Guns are strictly controlled in Japan, and shootings are rare.
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