May 24, 2019, 4:48 PM UTC / Updated May 25, 2019, 6:50 AM UTC

PARIS — An explosion Friday in the center of the French city of Lyon left at least 13 people injured, and an anti-terrorism probe has been launched, authorities said.

The explosion happened near Rue Victor Hugo and Rue Sala in the third largest city of France, about 300 miles southeast of Paris, national police told NBC News.

The blast was at 5:40 p.m. the French interior ministry told Euronews.

Kamel Amerouche, the regional authority's communications chief, said the explosion happened near or inside the Brioche Doree bakery.

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The Paris prosecutor’s office said that the anti-terrorist section would investigate, and that the anti-terrorism prosecutor would go to Lyon.

Denis Broliquie, mayor of Lyon's second district, told BFMTV he arrived minutes after the explosion, according to the Associated Press.

"What I saw was a refrigerated cooler in the Brioche Doree, whose windows had been shattered. It was the windows ... that superficially injured the people who were 1, 2 or 3 meters (yards) away," Broliquier said.

"But the fridge itself wasn't that damaged, which means the device had low force," Broliquier said.

Police have examined surveillance videos and are looking for a male bicyclist wearing a black sweater, black hood and black glasses. Police released a photo and urged people to come forward with information.

[#Lyon] #AppelÀTémoins pour retrouver l’homme suspecté d’être l’auteur de l’attentat.

Si vous avez des informations, appelez le 197. #AidezNous, votre témoignage peut être déterminant. pic.twitter.com/HcPc43nl9d — Police nationale (@PoliceNationale) May 24, 2019

Minister of the Interior Christophe Castaner asked local police to reinforce security at all public gatherings, such as sports and cultural events.

During a live interview about the European Parliament elections, French President Emmanuel Macron labeled this explosion an "attack."

He confirmed that there had been no fatalities, and expressed "a thought for the injured and their families."