Saudi Arabia will respond if rebels in Yemen carry out any 'aggressive moves,' the Saudi ambassador to the United States warned Wednesday a day after the Gulf kingdom declared an end to its month-long air campaign.

"If the Houthis or their allies make any aggressive moves there will be a response," ambassador Adel al-Jubeir told reporters, adding that Saudi Arabia was moving to a second phase in the campaign and hoped now that a political dialogue between all Yemeni parties would lead to elections and the implementation of a new constitution.