DUBAI/LONDON (Reuters) – Saudi Arabia said on Monday that two Saudi oil tankers were attacked off the coast of the United Arab Emirates, condemning it as an attempt to undermine the security of crude supplies amid heightened U.S.-Iranian tensions.

The UAE said on Sunday that four commercial vessels were sabotaged near Fujairah emirate, one of the world’s largest bunkering hubs lying just outside the Strait of Hormuz, but did not say who was behind the attack or describe the nature of it.

Iran, embroiled in an escalating war of words with the United States over sanctions and the U.S. military’s presence in the region, moved on Monday to distance itself.

The foreign ministry called the incidents “worrisome and dreadful” and asked for an investigation into