French authorities tweeted a photo Sunday of a fugitive wanted in connection to the Paris terror attacks, and cautioned the public: "Do not intervene yourself."

The national police identified the suspect as 26-year-old Salah Abdeslam, born in Brussels.

[AppelàTémoin] La #PJ recherche 1 individu susceptible d'être impliqué ds les attentats du 13/11/2015 #ParisAttacks pic.twitter.com/Gpr4MY1I53 — Police Nationale (@PNationale) November 15, 2015

The man is believed to be one of three siblings involved in the Friday gun and bomb attacks, which have killed at least 129 people and wounded hundreds of others. The authorities suspect the 26-year-old rented a black Volkswagen Polo that brought the attackers to the Bataclan concert hall, where as many as 89 hostages were killed inside, the Associated Press quoted French authorities as saying.

At least seven people were detained Sunday in Belgium in connection to the attacks, including Abdeslam's brother. Another one of their siblings is said to have been killed in the rampage at one of the world's most visited cities, the authorities said.

The Islamic State has claimed responsibility for the Friday attacks that included seven suicide bombings at a concert hall and near a sports stadium.