No terror group or individual has yet claimed responsibility for the recent bomb attack in the French city of Lyon which left 13 people wounded, French anti-terrorism prosecutor Remy Heitz said on Saturday.
The victims suffered leg injuries that weren't considered life-threatening, officials said, and the cause of the blast wasn't immediately known.
French President Emmanuel Macron characterized the blast as an attack shortly after it happened, telling an interviewer: "I'm late because there was an attack in Lyon".
Macron sent his thoughts "to the injured and their families".
The area where the explosion occurred, on the narrow strip of land between the Saone and Rhone rivers in the historic city centre, has been evacuated.
Police union spokesman Alain Bardelis said: "There was a crowd movement after the man was seen placing the bag on the ground. The windows were blown out", she said. The interior minister also was on site, and soldiers secured the area.
Denys Courbier, a doctor who works nearby, told BFM TV that he heard an "absolutely huge noise". Broliquier also said that the package was "intended to hurt".
The blast comes just days before the French people will head to the polls to vote in the European Union elections.
"There were bits of electric wire near me and batteries and bits of cardboard and plastic".
Local authorities said security has been enhanced in France's third-largest city, including with more police and military patrols.
Lyon and its extensive suburbs are home to 2.3 million people. The prosecutor's office said it is believed to have been caused by an explosive device, possibly a package bomb. Police found the attacker used triacetone triperoxide or TATP, a powerful homemade explosive.