Story highlights Two more people arrested in connection with horrific truck attack

Investigators had previously said that the attacker had outside help

(CNN) Two men have been arrested in connection with the Bastille Day attack in Nice in southern France, a spokeswoman for Paris' Anti-Terrorism Prosecutor's office told CNN.

Agnes Thibault Lecuivre said that the two had been arrested Monday and remain in custody.

"These two arrests have been made while investigators are still trying to figure out who gave logistic support to the attacker in Nice," she said.

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On July 14, Mohamed Lahouaiej Bouhlel drove a 20-ton truck for more than a mile along Nice's Promenade des Anglais during Bastille Day celebrations. The brutal attack killed 84 people in the Mediterranean city after hundreds had packed along the famous waterfront road to watch fireworks.

More than 200 people were injured as the truck careened down the busy street.