One of the most strategically important US military bases outside the continental U.S., often described as an "unsinkable aircraft carrier" in the central Indian Ocean, faces a mysterious drone threat, according to a new report.

TWZ cited the UK Ministry of Defense, which said it was aware of reported drone sightings over the remote US-UK military base but declined to identify the drones.

"We are aware of reported sightings of drones (UAS) over Diego Garcia," the UK Defense Ministry (MoD) told the military blog Monday morning. "We are unable to provide any details about a situation which may affect the security or operation of the joint U.K.-U.S. base on Diego Garcia."

"The U.S. and U.K. Commanding Officers on Diego Garcia consider and implement appropriate measures to ensure the security and safety of the base and the safety of the personnel on the island," MoD added.

TWZ noted that US officials "were less forthcoming" about the drone threat against Diego Garcia.

"As a matter of operational security, we do not discuss specific force protection measures or security procedures at U.S. military installations," an official from U.S. Pacific Command (PACOM) told the outlet on Friday. "We remain vigilant in protecting U.S. personnel and facilities."

Last Friday, the Air Force amn/nco/snco Facebook page said drones were spotted near the base's fuel tank farm, and a daytime curfew had been imposed. "

"Inbox: Diego Garcia. Drones spotted near fuel farm. Base on 0700 to 1900 curfew until further notice. Note: message us if you have further information, thanks," the Facebook post read.

A post on Sunday by the Air Force amn/nco/snco page, titled "Diego Garcia Curfew Reportedly Due to Drone Threats," displayed curfew times across the base.

The incident highlights the growing drone threat launched from ships, submarines, or uncrewed surface vessels. Officials did not disclose the drone group size.

Here's the classification via Piper Sandler:  

The incident is also a reminder that the drone scare on the US East Coast in December 2024 likely began with a drone or drones launched from a shipping container aboard a cargo ship. Drone threats are emerging outside of modern battlefields, something we've been warning about. 

Also last week, a one-way attack drone was found on the tarmac at Leipzig/Halle Airport, one of Europe's most important freight hubs. 

The drone threat is only going to get worse from here as the federal government is in full race mode to secure high-value assets, abroad and domestically.