A man was arrested after stabbing eight people and injuring seven others with what was believed to be bleach at a tyre factory in central Japan, officials said.
There was no immediate explanation of his motive.
Eight people were taken to hospitals after being stabbed by the man with a knife at a factory of the tiremaker Yokohama Rubber Co in the city of Mishima, in the Shizuoka prefecture, west of Tokyo, according to the Fujisan Nanto Fire Department.
The fire department told The Associated Press that five of the people who were stabbed were in serious condition, but other details were not available.
Shizuoka prefectural police said the attacker, a 38-year-old man, was arrested for alleged attempted murder at the factory, but did not give further details.
The suspect was carrying a survival knife and wearing what appeared to be a gas mask, the major Japanese newspaper Asahi reported, citing investigators.
Seven others were also injured by the bleach thrown at them during the attack, and taken to hospitals for treatment, the fire department said.
No other details were immediately known.
Japan has strict gun control laws and is known for rare violent crimes, but there have been a number of high-profile knife attacks in recent years.
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