A military helicopter flies the Tham Luang cave complex in the northern province of Chiang Rai, Thailand, July 9, 2018. REUTERS/Soe Zeya Tun

BANGKOK (Reuters) - An operation to rescue a group of Thai boys and their soccer coach trapped in a flooded cave resumed on Monday, said several officials with knowledge of the operation at the Tham Luang cave in the northern Thai province of Chiang Rai.

Nine members of the “Wild Boars” team are still inside the Tham Luang cave after foreign and Thai divers guided four boys out safely late on Sunday.