A crew in the Red Sea was forced to abandon ship after it was hit by Yemen’s Houthi rebels on Sunday, the first attack of its kind since President Trump announced a truce in May after he said the group promised to stop attacking Middle Eastern waterways.

The Yemen-based Houthi rebels launched their first attack on a commercial shipping vessel transiting the Red Sea in several months over the weekend, raising concerns that it could be the first in a new wave of such attacks.

The attack on the Magic Seas, a dry bulk carrier owned by Greece’s Stem Shipping, was the first on a commercial vessel since December by the group, which is backed by Iran. It was followed almost immediately by Israeli strikes on a number of Houthi-held ports in Yemen.