Jabhat al-Nusra

An alliance of forces led by the al-Qaida affiliated al-Nusra Front is battling the Syrian government for control of the key northern city.

The self-declared Islamic State and al-Qaida's Syrian affiliate, al-Nusra Front, appear to have cooperated on an assault to capture the camp earlier this week.

The measure targets travel of militants abroad as well as recruiting and funding for extremist groups. It was adopted at a meeting chaired by President Obama.

The president praised the five Arab nations that joined in airstrikes against extremists in Syria and said it should be clear that there are "no safe havens" for those who threaten America.

The strikes, supported by five Arab nations, are a major escalation in the campaign and hit other extremist groups, including one that the Pentagon says is planning to attack U.S. interests.

The 45 U.N. troops were taken hostage last month on the Syrian-controlled side of the Golan Heights.