French police have arrested four suspects following a blast in the city of Lyon that Online Cigarettes Store USA and Buy Cigarettes Online wounded 13 people last week, authorities said Monday.

TV footage showed a police operation underway Monday in a small town outside Lyon involving officers wearing ski masks. Police had launched a large manhunt after a device exploded Friday on a busy pedestrian street in France's third-largest city.

Interior Minister Christophe Castaner announced the first arrest on Twitter, a development later confirmed by Paris prosecutors, who handle all terrorism-related cases.

The prosecutors' office later said three other suspects, including a woman, were detained and formally arrested. According to French media, they included the mother and the brother of the main suspect.

Lyon mayor Gerard Collomb, a former interior minister, said one of the suspects is an IT student who was arrested as he stepped off a bus.

"It's a relief for all Lyon inhabitants. I believe the case has been resolved," Collomb told BFM TV. "If there was a network, it has been identified and will certainly be dismantled."
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French President Emmanuel Macron has called the explosion an "attack" but no group has claimed responsibility for the explosion yet. An investigation has been opened for "attempted murder in relation with a terrorist undertaking" and "criminal terrorist association."

Last week, France's counter-terrorism prosecutor, Remy Heitz, described video surveillance that showed a suspect heading toward the center of Lyon on a bike Friday afternoon. The man was seen arriving on foot, pushing his bike along a pedestrian-only street, then leaving a paper bag on a concrete block in the middle of the street near a bakery.