Iran has seized a US sea drone in the Gulf and attempted to tow it away - only releasing the unmanned vessel when a Navy warship and helicopter approached.
The Islamic Revolutionary Guard Corps (IRGC)'s Shahid Baziar warship attached a line to the Saildrone Explorer in the centre of the Persian Gulf in international waters late Monday night, said Commander Timothy Hawkins, a 5th Fleet spokesman.
The vessel then began towing the Saildrone Explorer, which carries cameras, radars and sensors for remotely monitoring the sea, Hawkins said.
