CAIRO (AP) — Yemen’s Iranian-backed Houthi rebels on Monday announced they are imposing a maritime embargo against Saudi Arabia in retaliation for a blockade on Yemen and a recent attack on Sanaa International Airport, threatening another vital waterway for global shipping and raising fears of renewed conflict.

A Houthi military spokesperson, Yahya Saree, said in a video statement that the maritime ban against Saudi Arabia will be effective immediately, describing it as an “equation of ‘an eye for an eye.’”