Saudi Arabia says a coalition it leads fighting Shiite rebels in Yemen has traded 109 Yemeni prisoners for nine Saudis held there.

The coalition said in a statement carried by the state-run Saudi Press Agency on Monday that it made the trade Sunday. It did not explain how the Saudis were detained in Yemen, though it said the Yemenis held had been detained in "areas of operations near the border of Saudi Arabia."

Saudi-led troops have been battling Shiite rebels known as Houthis for over two years now in support of Yemen's internationally recognized government.

More than 6,000 people have been killed in the fighting and millions are displaced in Yemen. Both sides have agreed to a cease-fire at midnight on April 10 ahead of peace talks starting April 18 in Kuwait.