Unknown attackers fired RPG missiles at the North Sinai Security Department in Arish on Sunday, marking the fiercest attack on security facilities since the Armed Forces launched a wide-scale military operation against militant hideouts, German news agency DPA reported. Eyewitnesses told the agency that the attack was followed by a firefight between the department's snipers and the assailants, which lasted for one hour. A security source said the attack was a response to a police campaign that had led to the arrest of militants in the peninsula. The same source added that no injuries or losses were reported. The army's largest camp is located a few steps away from the security department under attack. Al-Masry Al-Youm reported violent battles on Sunday between army forces and other unknown attackers in Moqata, North Sinai, adding that the army asked for air cover during the encounter. The attackers targeted the Sheikh Zuwayed police station with RPGs, while another group attacked the Reyasa checkpoint. No injured have been reported. The Armed Forces have been leading a security operation in Sinai which aims to track down militants in the region after an attack on a military checkpoint in Rafah on 5 August left 16 Egyptian soldiers dead.