The prosecutors' office says arrests started Monday, with more yesterday and today, with 10 people in custody so far.
The arrests are targeting people suspected of involvement in supplying to weapons to Amedy Coulibaly. He killed four people in a hostage-taking at the Hypercacher market in eastern Paris and a policewoman in another incident before dying in a shootout with police.
Coulibaly was an accomplice of brothers Cherif and Said Kouachi who shot and killed 12 at Charlie Hebdo's Paris office and also were killed in a shootout.
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