The Houthis reportedly attacked another commercial ship in the Gulf of Aden on Monday, as the Yemeni militia appears to be stepping up attacks on vessels along key maritime routes.

The UK Maritime Trade Operations, an agency that tracks attacks on shipping, said it received an alert from a ship’s master about an explosion in “close proximity” to the ship. It happened in an area 246 nautical miles southeast of Nishtun, a coastal town in the government-controlled Yemeni province of Mahra, close to Yemen’s remote Socotra island.

“The crew are reported safe, and the vessel is proceeding to its next port of call,” the agency said.

It was the second incident in the area reported by the UKMTO in the space of 24 hours. The captain and crew of a vessel abandoned ship on Sunday after it was damaged and took on water about 96 nautical miles southeast of Nishtun, the agency said.

On Sunday, the Houthis claimed credit for two other strikes on commercial shipping. A vessel called the Transworld Navigator was attacked with an explosive-laden drone in the Red Sea, and another called the Stolt Sequoia was targeted with ballistic missiles in the Indian Ocean, Houthi military spokesperson Yahya Sarea said in a televised statement. He accused the owners of the ships of violating the militia’s ban on shipping to Israeli ports.

According to the Marine Traffic ship-tracking app, the Stolt Sequoia is a Liberian-flagged oil and chemical tanker traveling from Bahrain to France.

The US Central Command reported on Sunday night that the Houthis were thought to have used a drone to strike the Transworld Navigator, a Liberian-flagged, Greek-owned and operated bulk cargo ship traveling from Malaysia to Egypt.

“Today, at 4 a.m. (Sanaa time), the crew reported minor injuries and moderate damage to the ship, but the vessel has continued underway,” the US military said.

Since their attacks on shipping began in November, the Houthis have sunk two ships, seized one and fired hundreds of ballistic missiles, drones and remote-controlled, explosive-laden boats at commercial and naval vessels in the Red Sea, the Gulf of Aden and the Indian Ocean in what they say is a campaign to put pressure on Israel to end its war in Gaza.

Yemenis have disputed the Houthi claims of support for the Palestinian people, accusing leaders of the militia of using the public outrage in Yemen over the killing of civilians in Gaza in an attempt to divert attention from their own internal problems, including growing public resentment over their failure to pay public-sector employees, and to recruit and rally the Yemeni public against opponents in Yemen.

Meanwhile, Yemenis from all sections of society and human rights organizations have launched an online campaign to draw global attention to the plight of dozens of Yemeni employees of the UN and other international organizations who are being held by the Houthis.

The militia abducted about 50 people in Sanaa this month, drawing widespread criticism from the UN as well as local and international rights groups.

In the online campaign, Yemenis call on the UN and the wider international community to take more action against the Houthis to secure the release of the detained workers, and to name and shame the militia for torturing and terrorizing the Yemeni people.

In a message posted on social media platform X, the Mothers of Abductees Association, an organization representing thousands of female relatives of civilian prisoners, wrote: “Tolerating the Houthis will not bring peace and security to Yemen.

“This silence on their misdeeds serves as an indirect justification for them. The UN must take a stronger stand and compel them to end their crimes against humanity and free all abductees promptly and unconditionally.”

Yemeni human rights activist Riyadh Aldubai urged the UN and international donors to condemn the Houthi crackdown on Yemeni workers and relocate their agencies’ offices to government-controlled Aden, warning that the Houthis will continue their rights abuses if not punished.

“UN and donors must face this escalation with strength. Condemn the abductions, enforce strict measures, and relocate operations to reduce Houthi control. It’s time to take a stand,” he said in a message on X.