On 6 April 2017, on the orders from U.S. President Donald Trump, USS "Ross" and USS "Porter" (both based in the Mediterranean) fired 60 Tomahawk missiles at Shayrat airfield, with 59 reaching the base, according to the CBS Evening News, in response to a suspected chemical attack in the town of Khan Shaykhun in the Idlib Province. The attack on Khan Sheikhoun is believed to have been launched from Shayrat. The United States had reportedly notified Russia, Syria's biggest ally, prior to the strike.