By Nidal al-Mughrabi Gaza (Reuters) - Hamas security forces allowed a rare rally on Monday by rival jihadist Salafi activists in the Gaza Strip in support of Islamic State and the deadly attacks by three Islamist gunmen in France. "Today, we are telling France and world countries that while Islam orders us to respect all religions, it also orders us to punish and kill those who assault and offend Islam's Prophet Mohammad," said one of the protesters, Abu Abdallah al-Makdissi. The demonstration was held five days after French satirical weekly Charlie Hebdo, in its first issue since two gunmen burst into its Paris ****** on Jan. 7 and shot dead 12 people, again published a cartoon of the Prophet Mohammad, sparking violent clashes in some Muslim countries. Many of the activists in Gaza, an enclave dominated by the Hamas Islamist group, wore uniforms similar to those of Islamic State fighters and identified themselves as supporters of various jihadist Salafi factions.