Trump called the deadly ground attack at Riyadh airport "unacceptable".

US President Donald Trump described Saturday's ground attack on Riyadh International Airport, which left at least 12 dead, as "unacceptable".

He told reporters he would speak with Mohammed bin Salman, the crown prince of Saudi Arabia, following this ground attack.

Mr. Trump added: "What happened in Saudi Arabia is unacceptable."

Saudi authorities attributed this ground attack to Houthis in Yemen.