The attack reportedly took place this morning outside a bakery in the southeastern French town.
A man has been arrested and counter-terrorism police are investigating.
News website Le Dauphine said three people were in a critical condition.
The mayor of Romans-sur-Isère said the perpetrator of the attack had entered several shops during the frenzy.
Pictures taken at the scene show a huge armed police response.
France is currently on a nationwide lockdown following the spread of the coronavirus.
The French Government has ordered against all non-essential travel until at least April 15.
This is a developing story, more to follow…
Published at Sat, 04 Apr 2020 11:04:00 +0000