Four people were placed in police custody on Tuesday (November 3) as part of the investigation into the knife attack in a church in Nice which left three dead, AFP learned from a judicial source.
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These four men were arrested in Val-d'Oise, this source told AFP.
One of them, aged 29, is suspected of having been in contact with the Tunisian assailant.
The other three, aged 23 to 45, were present at the home of the first.
Until these new arrests, six people had already been placed in police custody since Thursday.
But all were released, except for one suspect, a 29-year-old Tunisian.
This man is suspected of having traveled with the terrorist aboard the boat which docked on the Italian island of Lampedusa, in the Mediterranean, then of having transited with him to France.
The Tunisian assailant was still hospitalized on Tuesday morning.
