ISIS militants have executed three citizens of Syria's Raqqa, which is a stronghold of terrorists in the country, according to a spokesperson for the local militia forces.

"Today, Daesh (ISIS) terrorists crucified three Raqqa residents," Ria Novosti quoted the spokesperson as saying.

The spokesperson went on to say: "These people were accused of helping local residents to flee Raqqa and go to the northern part of the Raqqa province, which is not under Daesh control."

Syria and Iraq have been struggling with the rise of the ISIS terrorist group. ISIS has become notorious for its brutal terrorist attacks inside the two countries and also in some other countries, such as France, Germany, and the United States.

The destruction of Iraq, Syria and Libya created a power vacuum which gave the opportunity to the rise of ISIS, Al-Qaeda and other extremist Wahhabi groups.

The ISIS is known for its atrocities as well as its controversial verdicts and rules.

Two weeks ago, the terrorist group reportedly banned Muslim women from wearing burqas in security centers.

ISIS earlier made it obligatory for women to fully cover their bodies with a black veil when appearing in public, but then changed its self-imposed rules.

The militant group released an order stating that now women is now allowed to be wearing a niqab or burqa, a full body veil, when entering security and military facilities in the ISIS-held Iraqi city of Mosul.