CNN reports that two crew members of a Japanese owned Liberian flagged vessel were killed in an attack using a drone. The attack occurred in the Northern Indian Ocean, South of Oman. A BBC report says it occurred near the island of Misarah and that the ship is under US naval escort.
Given the location and the equipment recently seen on the Webber class cutters assigned to PATFORSWA, it is not impossible the escort may be one of the recently arrived cutters.
Chuck Hill's CG Blog 
I note that most reports say the ship is under US “naval” escort, not Navy escort. I have seen this done before, when the Navy was reporting something done by the Coast Guard.
From US Naval Institute News Service
https://news.usni.org/2021/07/31/u-s-navy-says-explosive-drone-attack-killed-two-on-merchant-tanker
“The Liberian-flagged merchant vessel, Mercer Street, is now underway on its own power and there is no ongoing threat to the vessel’s personnel. The vessel is currently being escorted by the aircraft carrier USS Ronald Reagan, with embarked Carrier Strike Group 5, and the Guided Missile Destroyer USS Mitscher.”
SecState says there will be a coordinated response.
https://www.al-monitor.com/originals/2021/08/blinken-vows-collective-response-ship-attack-blamed-iran
Pentagon reveals evidence of Iran’s role in Gulf tanker attack
https://www.al-monitor.com/originals/2021/08/pentagon-reveals-evidence-irans-role-gulf-tanker-attack#ixzz72st5PxOP
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