A new raid was underway later Thursday in Charleville-Mezieres, a French town near the Belgium border around 145 miles northeast of Paris, according to French police.
A witness told TV station France 3 they had heard explosions.
Authorities also conducted six raids overnight in Brussels, including in the impoverished Molenbeek neighborhood where the suspected Paris attacks leader, Abdelhamid Abaaoud, grew up, a spokesman for Belgium's federal prosecutor told NBC News.
U.S. & World
The raided homes belonged to family and friends of Bilal Hadfi. The 20-year-old was one of three suicide bombers who attacked the Stade de France during a soccer game between France and Germany. One person was arrested, the spokesman said, adding that the operation was "ongoing."