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DUBAI, United Arab Emirates (AP) — The U.S. Navy says Iran has once again briefly seized an American sea drone before letting it go. Tehran says its navy seized two drones before releasing them.

Cmdr. Timothy Hawkins, a spokesman for the Navy’s Mideast-based 5th Fleet, acknowledged the incident on Friday to The Associated Press. He declined to immediately elaborate.

Iranian state television showed images of at least one drone on the deck of a vessel with sailors looking at it.

This marks the second-such incident involving Iran in recent days as negotiations over Tehran’s nuclear deal with world powers hang in the balance.