Police used a Taser gun while arresting the attacker
Video footage showed Satoshi Uematsu smiling in a police car as he was driven away.
Some reports said he had held a grudge after being fired from his job at the facility.
25 people were wounded, 20 of them seriously, a prefectural official said
Witnesses said the assailant, a 27-year-old man, shouted "Allahu Akbar" ('God is Greatest' in Arabic)
He succumbed to the severe wounds in his head.
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The stabbings also come less than a month after the November 13 jihadist rampage in Paris, claimed by IS, which killed...
"We are treating this as a terrorist incident," Richard Walton, who leads the Counter Terrorism Command at London's Metropolitan Police...
The suspect and the victim had allegedly fought earlier.
They had conflict before, an official said