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There was a RPG but no detail of what exactly, from the wiki article (with multiple sources) :
> The siege lasted for eight to nine hours, and at around 4:30 p.m. there were at least three explosions near the building. At around 5:00 p.m., a police team landed on the roof of the building and a helicopter landed nearby. Before police could reach them, the pair ran out of the building and opened fire on police. The brothers had stated a desire to die as martyrs and the siege came to an end when both Kouachi brothers were gunned down. Lilian Lepère was rescued unharmed. A cache of weapons, including Molotov cocktails and an RPG launcher, was found in the area.