The strikes targeting Islamic State fighters, facilities and vehicles were carried out by fighter aircraft, bombers and remotely controlled aircraft.
The Pentagon said today that five of the strikes were carried out in Syria and 12 in Iraq.
The strikes targeted Islamic State tunnels, explosive manufacturing sites and other targets such as bridges and Islamic State fighting outposts.
All US aircraft returned safely. The strikes were conducted as part of Operation Inherent Resolve, the operation that is designed to target the Islamic State group.