A Liberian-flagged cargo ship came under fire Monday in the Red Sea, with two security guards on board reportedly hurt and two others missing in an assault that followed Yemen's Houthi rebels purportedly sinking another vessel in a similar attack.

Two commercial vessels targeted in 24 hours raise fears of an escalated campaign against Israel-linked shipping.

Two crew members of a Greek-managed vessel were wounded and two were missing following a drone attack off Yemen by Houthi militants. The incident is part of rising attacks affecting merchant ships in the Red Sea,