PARIS—Seven people were detained Sunday in Belgium in connection with deadly attacks in Paris as the city entered three days of mourning for the 129 people killed in the worst violence in France in decades.
Thousands of French troops were deployed and tourist sites stood shuttered in one of the most visited cities on Earth, while more details started to emerge about the investigation.
The Islamic State (ISIS) claimed responsibility for Friday’s gun and bomb attacks on a stadium, a concert hall and Paris cafes that also wounded 350 people, 99 of them seriously.
Authorities said three teams of attackers were involved and seven suicide bombers blew themselves up—three near the stadium and three at the concert hall and one not far from it.
Authorities have not said if there are more attackers at large.
A French police official said Sunday that three Kalashnikovs were found inside a Seat car found in Montreuil, a suburb 6 kilometers (nearly 4 miles) east of the French capital. It was one of two vehicles known to have been used in the attacks. The official, who could not be named because the investigation is ongoing, said the weapons have not yet been analyzed.
In Belgium, an official said the seven people detained would hear later Sunday whether they would be held in custody longer. Three other people were arrested there Saturday.
The official, who spoke on condition of anonymity due to the ongoing investigation, also said two of the seven attackers who died in Paris on Friday night were French men living in Brussels. He said one was living in the Molenbeek neighborhood, which is considered a focal point for religious extremism and fighters going to Syria.
