Iran test fired a high-speed torpedo it's developing over the weekend in the highly trafficked Strait of Hormuz.
According to NBC News, the underwater missile program is still in its testing phase. Iranian officials are hopeful the weapon will eventually have a range of roughly six nautical miles at about 250 mph.
It was not clear whether Sunday's test was successful.
NBC also learned from officials at the Department of Defense that the test did not endanger any U.S. ships or assets in the Persian Gulf.
The Strait of Hormuz links the Persian Gulf and the Gulf Oman, the latter of which opens up to the Arabian Sea. Oil tankers carrying hauls from the Middle East stream through the 26-mile-wide passage every day.
According to Fox News, Sunday's torpedo test took place in Iranian waters and did not violate any international rules. The network reports that the same torpedo was tested in February 2015.
Iran has provoked American warships in the region on several occasions in recent years, most notably in January 2016 when it briefly detained 10 U.S. sailors after they allegedly strayed into Iranian waters around Farsi Island.
Last month, an Iranian Revolutionary Guard vessel got to within 1,000 meters of a U.S. guided-missile destroyer before it turned away. The U.S. ship, the USS Mahan, fired warning flares at the approaching boat during the tense encounter.
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