Saudis say tracking Yemen rebel groups headed to border

Saudi Arabia says that multiple groups of Yemeni Shiite rebels are moving toward the two countries' shared border. The Gulf kingdom is leading a coalition of countries conducting airstrikes against the rebels, known as Houthis.

Speaking from the Saudi capital, Riyadh, Ahmed Asiri, a spokesman of the coalition campaign, told reporters that the coalition was tracking at least two rebel groups. Asiri promises that Saudi Arabia and the coalition "will not allow" the Houthis to cross or threaten the Saudi border.