Egypt’s President Abdel Fattah al-Sisi on Wednesday ordered his military command to use all force necessary to secure the Sinai peninsula within the next three months. The order comes after a militant attack on a mosque that killed more than 300 people. “It is your responsibility to secure and stabilize Sinai within the next three months,” Sisi said addressing his new chief of staff, without giving details on any operations, Reuters reports. “You can use all brute force necessary,” the president said. No group has claimed responsibility for Friday’s mosque attack, but Egyptian forces have been battling an Islamic State (IS, formerly ISIS) affiliate in the North Sinai for more than three years.