PARIS — A suspect in the May 24 attack in the Jewish Museum in Brussels that left four dead, including two Israelis, has been arrested, French judicial sources said on Sunday.The 29-year-old French citizen, Mehdi Nemmouche, was captured in Marseille, in France, and was said to possess a gun and a Kalashnikov assault rifle - the sort used in the attack in Brussels. He has been in custody since Friday.The Belgian police are also looking for a possible terrorist link, the suspect having allegedly fought in 2013 as a member of Syrian opposition forces. Belgian police had published surveillance footage from Saturday's deadly attack at Brussels' Jewish Museum, asking citizens to help capture the attacker.In the images released by the police, the attacker, his face covered, was seen entering the building and firing a Kalashnikov rifle numerous times.After the shooting, the killer left the building into a crowded street, where he disappeared.