Yemen’s Houthi rebels once again threatened oil tankers passing along Yemen’s strategic western coast, Al Arabiya reports.

“The battleships and oil tankers of the aggression and their movements will not be safe from the fire of Yemeni naval forces if they are directed by the senior leadership (to attack),” an unnamed Houthi military leader said, according to Houthi media sources, Haaretz reports.

The rebels’ leadership, however, took pains to note it would only target vessels of “aggressor” nations, according to RT.

In a statement posted on Facebook, Abdel-Malek El Houthi, a Houthi leader, stated that “only those who attack our country” will be subject to attack and that “international navigation will remain safe,” RT reports.

The two sides have recently upped their ante with the Houthis apparently firing a missile at Riyadh and the Saudi-led coalition instituting a widespread blockade of rebel-controlled areas, according to Haaretz.

In September, the rebels threatened to attack Saudi oil tankers or launch ballistic missiles against Saudi Arabia and the UAE if the port of Hodeidah was attacked, Reuters reported at the time.

Saudi Arabia is leading a coalition to support the internationally recognized government of Yemeni President Abdrabbuh Mansur Hadi.