An oil and chemical tanker was struck by several projectiles late Wednesday, with casualties reported on board. The vessel is named the Acers.

Maritime intelligence firm Vanguard and the UK Maritime Trade Operations agency reported the incident. The Wall Street Journal’s Georgi Kantchev first detailed it publicly.

Few details were available about the exact location or the condition of the crew. The attack is the latest in a string of strikes on shipping in the region.

The incident comes as attacks on tankers have surged amid the US-Iran conflict. Tensions around the Strait of Hormuz have pushed oil prices and shipping costs higher this week.

The United States has also sanctioned 17 Iranian tankers this week as part of its pressure campaign on Tehran’s oil trade. Maritime insurers are watching the region closely as the security situation deteriorates.

Shipping security firms have raised threat levels across the region this month. The war between the US and Iran has turned the Gulf into one of the world’s most dangerous waterways.

Insurance costs for vessels passing through the area have climbed. Some shipowners are rerouting or pausing voyages until the security picture clears.