OSAKA — Police arrested a man wielding a kitchen knife Sunday morning after a 41/2-hour standoff at his home in Hirano Ward, Osaka.

The man’s three grandchildren — aged between 1 and 6 — were rescued from the house unhurt after the incident.

The 49-year-old unemployed man was arrested for violating the Firearm and Sword Control Law after police persuaded him into tossing the knife out at around 1:50 a.m.

The man, who has a history of mental illness, lived in the house with his wife, a son, the son’s wife and their three children, police said.