U.S. strikes ISIS in Syria

In this photo released by the U.S. Navy, sailors stand watch on the bridge while Tomahawk cruise missiles are launched aboard the guided-missile cruiser USS Philippine Sea (CG 58), in the Arabian Gulf, Sept. 23, 2014.

Syria said Tuesday that Washington informed President Bashar Assad's government of imminent U.S. airstrikes against the Islamic State group, hours before an American-led military coalition pounded the extremists' strongholds across northern and eastern Syria.

Air strikes against ISIS

In this photo released by the U.S. Navy, the guided-missile cruiser USS Philippine Sea launches a Tomahawk cruise missile at Islamic State group positions in Syria as seen from the aircraft carrier USS George H.W. Bush in the Arabian Gulf on Tuesday, Sept. 23, 2014. Syria said Tuesday that Washington informed President Bashar Assad's government of imminent U.S. airstrikes against the Islamic State group, hours before an American-led military coalition pounded the extremists' strongholds across northern and eastern Syria.

Air strikes against ISIS

The U.S. and five Arab nations attacked the Islamic State group's headquarters in eastern Syria in nighttime raids, Sept. 22, 2014.

Air strikes against ISIS

An F/A-18C Hornet, attached to Strike Fighter Squadron (VFA) 87 prepares to launch from the flight deck of the aircraft carrier USS George H.W. Bush (CVN 77) to conduct strike missions against ISIL targets, in the Arabian Gulf in this U.S. Navy handout photograph provided Sept. 23, 2014.

The United States and Arab allies hit ISIS militant targets including training camps, headquarters and weapon supplies in northern and eastern Syria in dozens of air and missile strikes on Tuesday, the U.S. military and a monitoring group said.

Air strikes against ISIS

An F/A-18E Super Hornet, attached to Strike Fighter Squadron (VFA) 31, and an F/A-18F Super Hornet, attached to Strike Fighter Squadron (VFA) 213, prepare to launch from the flight deck of the aircraft carrier USS George H.W. Bush (CVN 77) to conduct strike missions against ISIS targets, in the Arabian Gulf in this U.S. Navy handout photograph provided Sept. 23, 2014.

Air strikes against ISIS

The guided-missile destroyer USS Arleigh Burke (DDG 51) launches Tomahawk cruise missiles while conducting strike missions against ISIL targets from the Red Sea, in this handout photograph taken and released on Sept. 23, 2014.

Air strikes against ISIS

A Tomahawk cruise missile is launched against ISIS targets from the US Navy guided-missile destroyer USS Arleigh Burke, in the Red Sea, Sept. 23, 2014.

Air strikes against ISIS

At the Pentagon Lt. Gen. William C. Mayville Jr. speaks about the bombing campaign in Syria, September 23, 2014. Mayville talked about the U.S. and Arab air strikes in Syria against the jihadist group ISIS.

Air strikes against ISIS

Pictures showing an ISIS Command and Control Center in Syria before, left, and after it was struck by bombs dropped by a U.S. F-22 fighter jet are seen in handouts released by the U.S. Department of Defense (DOD), Sept. 23, 2014.

This was the first time the F22 was used in a combat role according to the DOD. The United States and its Arab allies bombed Syria for the first time on Tuesday, killing scores of Islamic State fighters and members of a separate al Qaeda-linked group, opening a new front against militants by joining Syria's three-year-old civil war.

Air strikes against ISIS

Pictures showing what U.S. officials say was an ISIL finance center in Syria show a view before, left, and after it was struck by a Tomahawk missile in handouts released by the U.S. Department of Defense (DOD), Sept. 23, 2014.

Air strikes against ISIS

An image released by the U.S. Dept. of Defense shows the impact of air strikes carried out by U.S. and Arab allies on the Abu Kamal ISIS residence in Syria, Sept. 23, 2014.

Air strikes against ISIS

Residents inspect damaged buildings in what activists say was a U.S. strike, in Kfredrian, Idlib province, Syria, Sept. 23, 2014.

Air strikes against ISIS

Children ride bikes in front of damaged buildings in what activists say was a U.S. strike, in Kfredrian, Idlib province, Syria, Sept. 23, 2014.

Air strikes against ISIS

Residents inspect damaged buildings in what activists say was a U.S. strike, in Kfredrian, Idlib province, Syria, Sept.  23, 2014.