The European Parliament has labeled the Islamic State’s actions against Christians and other religious and ethnic groups as genocide, calling for world powers to hold the group responsible.

The parliament on Thursday adopted a resolution that states the Islamic State “is committing genocide against Christians and Yazidis, and other religious and ethnic minorities who do not agree with” its radical religious beliefs, adding the actions of the insurgency “are part of its attempts to exterminate any religious and ethnic minorities from the areas under its control.”

The resolution also accuses the Islamic State of “egregious human rights abuses, which amount to crimes against humanity and war crimes.” The genocide label carries some added weight, though, because the United Nations has adopted a treaty devoted to punishing and preventing it.

The treaty, implemented in 1948, defines genocide as certain actions “committed with intent to destroy, in whole or in part, a national, ethnical, racial or religious group.” The actions include murdering the group’s members, or inflicting serious bodily or mental harm upon them.

The parliament’s resolution calls for the United Nations Security Council to ask the International Criminal Court to launch an official investigation into the genocide allegations.

It was approved one week after the Parliamentary Assembly of the Council of Europe, a group concerned with human rights, adopted a similar resolution that stated the Islamic State has “perpetrated acts of genocide and other serious crimes punishable under international law.”

Lawmakers and advocacy groups have called for the United States to declare the Islamic State’s actions as genocide, though the country has yet to take that step. Resolutions to that effect have been introduced in the House and Senate, but they have not been adopted.

The European Parliament’s resolution details several of the Islamic State’s actions against civilians, notably Christians and Yazidis, as the group captured large parts of Syria and Iraq.

The resolution states the Islamic State killed some 5,000 Yazidis and forced some 2,000 women into marriages, slavery or human trafficking. Others have been forced to convert to Islam.

The Islamic State also kidnapped more than 220 Assyrian Christians last February, according to the resolution. While some of them have since been released, the fate of most remains unknown.

The resolution charges that more than 150,000 Christians fled their homes on Aug. 6, 2014, as the Islamic State gained territory in Ninevah Province. Some of those who did not escape were captured, and the Islamic State executed some and enslaved others. The Islamic State still controls Mosul, leaving thousands of Christians displaced without any of their possessions.

According to ADF International, a religious freedom advocate, the number of Christians living in Syria and Iraq has dropped from 2.65 million to 775,000 in recent years. The organization’s director of EU advocacy, Sophia Kuby, said it welcomed the European Parliament’s resolution.

“It was high time that the EU responded to the undeniable evidence of this genocide, which includes assassinations of church leaders, torture, mass murders, kidnapping, sexual enslavement, systematic rape of Christian and Yazidi girls and women, and the destruction of churches, monasteries, and cemeteries,” Kuby said in a statement.

Last month, Open Doors USA released a report that said Christian persecution had reached “unprecedented” levels and warned that it would likely continue to increase.

The nonprofit group released a list of the top 50 countries where Christians face the most persecution. Middle Eastern countries occupied five of the top 10 spots, and Islamic extremist groups were a source of persecution in four others.

In December, the United States Commission on International Religious Freedom, an independent group that makes recommendations to the government, urged officials to designate Christians, Yazidis and other groups victims of Islamic State’s genocide.

No such declaration has been made.

“The hallmark of genocide is the intent to destroy a national, racial, ethnic, or religious group, in whole or in part,” the commission’s chairman, Robert P. George, said in a statement at the time. “ISIL’s intent to destroy religious groups that do not subscribe to its extremist ideology in the areas in Iraq and Syria that it controls, or seeks to control, is evident in, not only its barbarous acts, but also its own propaganda.”