Two Saudi pilots were killed on Friday when their Apache crashed during operations by the Saudi-led coalition on the border with Yemen, the Saudi forces joint command said in a statement.

According to the statement, the command was investigating the cause of the crash, which took place in Saudi Arabia's border province of Jizan.

The statement named the two pilots as Ali Bin Mohammed Al Qarni and Nasser bin Mohammed Al Harthy.

The Saudi southern borders were exposed to attacks by the Houthis and loyalists to ousted Yemeni president Ali Abdullah Saleh leaving some military personnel and civilians dead and injured.