The United States airstrikes in Libya did some damage to ISIS.

FOX's Jessica Golloher reports: 

Pentagon spokesman Peter Cook says the U.S. strikes in Libya do not have an end point at this time. The hits took place in ISIS' stronghold of Sirte on Monday after the United Nations backed government in Libya asked for the U.S.' help.

Washington says the strikes are the start of a sustained campaign against the Islamic insurgents. The U.N.-backed government says they were carried out at specific locations and caused severe losses. Forces allied with the U.N.-backed government have been battling ISIS since May.

The militants seized Sirte last year, making it their most important base outside of Syria and Iraq. 

In the Mid-East bureau, Jessica Golloher, FOX News.