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French police are hunting a man who was seen on CCTV leaving a paper bag outside a French bakery a minute before it exploded and injured 13 people.

More than 100 police investigators and scientific officers were searching for the man who was spotted on security cameras at around 5.30pm on Friday.

He was seen leaving a paper bag in front of a bakery on a pedestrian shopping strip in Lyon. The package exploded about a minute after he left.

Police were able to track the movements of the man, who appeared to be around 30 years old, for 10 minutes before the attack and are still trying to identify him.

He had a bicycle and was wearing sunglasses and a cap.

Anti-terrorism prosecutor Remy Heitz said there had been no claim of responsibility yet for the bomb and called for witnesses to help police find the suspect.

The case is being handled as a terrorism investigation given the circumstances of the attack and the use of an explosive device capable of hitting a large number of people with screws and metal balls packed into a bag, he said.

Police found pieces of remote detonator and white plastic fragments that were probably part of the device, Mr Heitz added.

Eleven of those wounded in the explosion, including a 10-year-old girl, were hospitalised.

Authorities have boosted surveillance and protection of public areas after Islamist groups carried out a string of attacks around France that killed dozens of people and wounded hundreds in the past few years.

The Interior Ministry called for local authorities to raise surveillance and security in and around public areas and public events.

The police chief of the region around Lyon banned demonstrations in the northern part of the city and reinforced army patrols in the city.