Yemeni rebel mortar attack kills three Saudi border guards

Yemen's Houthi rebels have killed three Saudi border guards in a mortar attack, the Saudi Defense Ministry said Saturday, as a plane loaded with medical aid arrived in the rebel-held Yemeni capital.

An unnamed military official quoted in the Defense Ministry statement said the incident took place Friday in the Saudi border province of Najran.

The Defense Ministry said its forces responded with gunfire, and that 500 Houthi fighters have been killed in clashes along the border since a Saudi-led air campaign against them began late last month. Earlier this month, three Saudi border guards were killed in separate clashes with the Houthis.

A plane loaded with badly needed aid meanwhile landed in Yemen's rebel-held capital, Sanaa, on Saturday.

Photos posted on the official Twitter account of the International Committee of the Red Cross showed aid workers unloading the supplies. The group said the shipment consists of more than 35 tons of medical aid, generators and emergency sanitation equipment.

The first such delivery to the capital since the airstrikes began more than two weeks ago landed on Friday. Saturday's shipment was more than double the size of the previous one.