The deaths appear to be the first at the hands of Somali pirates in more than a decade.

Pirates have killed five crew members on board a Palau-flagged oil tanker off the coast of Somalia before security forces rescued the ship, according to Somali authorities.

The deaths on the tanker, the MT Honour 25, were announced on Tuesday.

They appear to be the first deaths at ⁠the hands of Somali pirates in more than a decade and come amid a resurgence of Somali piracy that experts have attributed in part to the effects of the United States and Israel’s war on Iran.

The MT Honour 25, which authorities said was carrying 18,500 barrels of oil, was seized by pirates off Somalia on April 21.

The Information Ministry of Puntland, a semiautonomous region of Somalia, said in a statement that a rescue mission had freed the ship and captured 16 suspected pirates.

“Before the operation began, the pirates on board the ship killed five of the crew,” the statement said. “Among those killed were three from Pakistan, one from Myanmar and one from India.”

Four other crew members, three Pakistanis and one Indian, were injured, it said.

In a post on social media, the Puntland Maritime Police Force said the vessel was “safe” and under the government’s control. It said efforts were continuing to find others involved in the hijacking.

The rescue follows another operation last week in which the maritime police freed the Sibu 1, a tanker sanctioned by the US that Somali pirates had hijacked in August.

But 28 of the 41 pirates arrested in that operation later escaped while being transferred to jail, and several Puntland security officials accused local police of complicity.

At least 15 attacks have been reported off Somalia since April, according to officials.

A previous wave of piracy, from 2008 to 2014, disrupted one of the world’s busiest shipping routes, cost the global economy billions of dollars and resulted in hundreds of millions of dollars in ransom payments.