Tokyo ? A man went on a shooting rampage Thursday in his central Japan home, killing a policeman, wounding three other people – including his son and daughter – and taking his wife hostage, news reports and police said.

Hundreds of police surrounded 50-year-old Hisato Obayashi’s tree-shrouded house in a tense standoff in Nagakute city overnight and into this morning. One news report said Obayashi was a former mobster.

The sequence of events was still unclear, but Obayashi appeared to have taken his wife hostage, shot his children and then shot at police responding to the emergency call.