French police were on Saturday pulling out all the stops to locate a suspect following a blast in the heart of Lyon that wounded 13 people.
"All means have been activated to identify and detain the person who committed this act," Paris prosecutor Remy Heitz told media in Lyon, the third-biggest French city.
The blast occurred just two days ahead of hotly contested European Parliament elections and with France on watch for any repeat of recent deadly terrorist attacks which have rocked the country.
Heitz has taken charge of the investigation into "attempted murder in relation with a terrorist enterprise and association with terrorist criminals."
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