Iran tested a suicide drone against a practice vessel in the Gulf and fired one other missile or drone without warning ships in the area, Reuters quoted a US official in the region as saying. The one-way drone was launched on Wednesday from the Jask area of Iran 8-9 miles out to sea - within Iran's territorial waters - against a practice barge, the official said, citing US intelligence data. "Essentially practicing hitting merchant vessels. That's the only reason why you would do that in the Gulf of Oman," the official said.