ISLAMABAD - Pakistan will send troops to Saudi Arabia to join the coalition against Yemeni rebels, a senior government official said on Monday. 'We have already pledged full support to Saudi Arabia in its operation against rebels and will join the coalition,' the official said. Pakistan is a regional ally of Saudi Arabia, the main Sunni Muslim power in the Gulf. A Saudi-led military coalition is conducting air strikes against Shi'ite Muslim Houthi forces.