A man was arrested in Cannes, France, after threatening to blow up a synagogue in a social media post.In Monday's live video, the man, claiming to be Algerian, said he planned to buy €5,000 worth of C4 [explosive] in Marseille. “They give me 10 kg.; I'll blow up the synagogue!” He added, “I'm going to make a hole the size of an asteroid.”MENACE D'ATTENTAT ‼️Cible: Synagogue de Cannes « La Synagogue de @villecannes …Je vais acheter pour 5000 € de C4 à Marseille, il me donne 10 kilos, je la fais