The U.S. has stepped up the fight against ISIS online.

FOX's Rachel Sutherland reports:

The Pentagon is launching new aggressive cyber attacks against Islamic State militants in a targeted effort to erode their ability to recruit followers online.

The surge of computer-based military operations by U.S. Cyber Command began shortly after Defense Secretary Ash Carter prodded commanders to ramp up the fight on the cyber front.

Officials are not giving many details on the effort, other than to say the attacks include efforts to prevent the group from passing around propaganda, videos, or other types of recruiting and messaging on social media sites such as Twitter.

In Washington, Rachel Sutherland, FOX News.