Updated at 12:25 p.m. ET
A man used a knife to attack people at the Notre Dame Basilica in Nice, France, Thursday, killing three people, authorities say. Several more were injured. Police have arrested a suspect, according to Mayor Christian Estrosi.
Two people were killed inside the church, and another died outside it, according to local media reports.
"Very clearly, it was France that was attacked," French President Emmanuel Macron said outside the church in Nice, after hurrying to the site of the attack.