The retired US general in charge of coordinating the American-led coalition’s fight against Islamic State militants is urging allies to also combat the jihadists by targeting their extremist online propaganda.

The Islamic State group is promoting its “horrendous brand of warfare” online, where it “recruits and perverts the innocent,” Marine Gen. John Allen said Monday during a meeting of Western and Arab partners in Kuwait, according to Agence France-Presse.

“It is only when we contest ISIL’s presence online, deny the legitimacy of the message it sends to vulnerable young people… it is only then that ISIL will truly be defeated,” Allen said, using an alternative name for ISIS.

Allen was meeting with representatives of coalition countries including Bahrain, Britain, Egypt, France, Iraq, Jordan, Lebanon, Oman, Qatar, Saudi Arabia and the United Arab Emirates.

ISIS, which has seized large parts of Syria and Iraq and declared an Islamic “caliphate,” operates a sophisticated online presence, posting frequent propaganda videos and publishing its own glossy magazine, Dabiq, through which it seeks to recruit jihadists from the West.

Dabiq has called on Muslims to kill “every Crusader possible,” according to a recent report in the Daily Mail.

Some of the videos have featured brutal atrocities, including the on-camera beheadings of two US journalists and two British aid workers.

Western governments have been increasingly alarmed by the numbers of Europeans and Americans making their way to Syria to fight with ISIS.

Concern is also growing over the group’s online influence among disaffected young Muslims living in the West and its calls for them to carry out attacks on Western targets.

The Web message apparently resonated for the Muslim extremist who attacked four rookie NYPD cops in Queens last week.

Zale Thompson, 32, reportedly watched ISIS beheading videos before striking one officer in the head with a hatchet and another one in the arm. The jihadist sympathizer was shot dead.