A gunman killed three people in southwestern France on Friday as he held up a car, fired on police and seized hostages in a supermarket, screaming "Allahu akbar" before security forces stormed the building and he was killed, authorities said.

Sixteen other people were wounded, including two who were seriously hurt, in what President Emmanuel Macron called an act of "Islamist terrorism."

The Islamic State group claimed responsibility for the attack. Macron said security services were checking that claim.