Yemenese authorities have warned citizens against hiding Al-Qaeda militants and urged them to co-operate with security forces. The State media quoted a security source as saying that the war against Al-Qaeda elements is open whenever or wherever these elements are found. Yemen has vowed to pursue al-Qaeda unless it disarms and rejects violence. The warning comes after the alleged leader of an Al-Qaeda cell in Yemen was reportedly killed by security forces. Meanwhile, a group of Yemeni clerics today issued a statement, warning that jihad or holy war was permitted in the case of any foreign military intervention in the volatile country.