A US Navy ship fired warning shots at fast attack vessels harassing US ships in the area. It started on Tue after several Iranian vessels harassed a US ship in the Strait of Hormuz.
https://www.yahoo.com/news/u-navy-ship-fires-warning-shots-toward-iranian-174654799.html
https://www.yahoo.com/news/u-navy-ship-fires-warning-shots-toward-iranian-174654799.html