In Yemen, security forces have killed an Al-Qaeda leader in the province of Lahj. Police chief said, Ammar Qaid, known as Al-Qaeda's "emir" in Lahj, was killed today in an exchange of fire with counter-terrorism forces after refusing to surrender. Meanwhile, the Saudi-led coalition battling Yemen's Houthi rebels says two crew members have been killed in an attack on one of its warships in the Red Sea on Monday.<br/> '<br/>Yemen's long-running conflict escalated in March 2015 when a Saudi-led coalition began bombing raids against the Huthis who had stormed the capital and taken swathes of central and northern territory. Around 7,400 people have died in air strikes and clashes since then, the UN says, and aid agencies have warned of an impending humanitarian crisis in the Arab world's poorest nation.