2016 United States–Iran naval incident

On January 12, 2016, two United States Navy riverine command boats were seized by Iran's Islamic Revolutionary Guard Corps (IRGC) Navy after they entered Iranian territorial waters near Iran's Farsi Island in the Persian Gulf. Initially, the U.S. military claimed the sailors inadvertently entered Iranian waters owing to mechanical failure, but it was later reported that they entered Iranian waters because of navigational errors.

Source: Wikipedia — 2016 United States–Iran naval incident (CC BY-SA 4.0)