Saudi Arabia’s energy minister Khalid al-Falih revealed on Monday that two Saudi oil tankers had been targeted in a “sabotage attack” off the coast of the United Arab Emirates.

In a statement to state-owned Saudi Press Agency (SPA), the minister confirmed the attack occurred at 6 a.m. local time off the coast of Fujirah, which is part of the UAE, as the ships were travelling towards the Arabian Gulf.

“Two Saudi oil tankers were subjected to a sabotage attack in the exclusive economic zone of the United Arab Emirates,” Falih said the statement.

One of the ships was loaded with crude oil from the port of Ras Tanura, a city in the Eastern Province of Saudi Arabia, and was en route to Saudi Aramco’s customers in the US, it added.