According to the Times, it was registered to a private company whose address was a UPS store mailbox in Virginia, deepening the mystery over who was operating it—and for whom.

“It would be one thing if the US didn’t have an overt maritime strike campaign, but they do, and they’re posting snuff films of boats going up in flames regularly,” Brian Finucane, a former State Department lawyer who specializes in the laws of war, told the Times.

“And that’s what makes this even more squirrelly,” added Finucane, now a senior adviser in the US Program at the International Crisis Group. “Who are these people that are operating, and under what authority? And they are using a UPS store as their company address? Come on.”