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The White House this week hosts a summit on countering violent extremism, coincidentally just days after murderous attacks with multiple victims in the United States and Europe.

The meeting, featuring speakers and participants from the US and abroad, has been in the works for months, part of a program the Obama administration began in 2011. But it comes just as a new report warns of a rise in violence by 鈥渓one wolves鈥� or 鈥渓eaderless resistance鈥� groups composed of no more than two people.

Although the White House program has a broad mandate, recent events at first glance are connected to Islam: The shooting deaths last week of three young Muslims in Chapel Hill, N.C., by a suspect who may have been motivated by religious hatred as well as other issues, and the shooting attacks on a free speech event and a synagogue in Copenhagen, Denmark, over the weekend, believed to have been聽inspired by Islamic radicalism. Two people were killed and five police officers wounded聽in those attacks.

Under the Obama administration鈥檚 program, Boston, Los Angeles, and Minneapolis-St. Paul have taken the lead 鈥渋n building pilot frameworks integrating a range of social service providers, including education administrators, mental health professionals, and religious leaders, with law enforcement agencies to address violent extremism as part of the broader mandate of community safety and crime prevention,鈥� the White House said in its statement last month announcing the summit.

Overcoming distrust has been a challenge for federal officials. Some critics say the apprehension of young men 鈥� such as Christopher Lee Cornell, recently charged with plotting an attack on the US Capitol 鈥� amounts to legally questionable entrapment.

The Los Angeles program has drawn criticism from civil rights groups, including the Council on American-Islamic Relations. Haroon Manjlai, a spokesman for the council鈥檚 Los Angeles chapter, said the group is worried that the program will infringe on Muslims鈥� freedom of speech and religion, and might hurt their public image.

The council鈥檚 national office issued a statement ahead of the summit questioning the effectiveness of programs closely tied to a government that many Muslims don鈥檛 trust. 鈥淐redible community voices who are not viewed as 'being in the government鈥檚 pocket鈥� are necessary,鈥� it said.

The radicalization of Muslim youth has been a major concern in Minnesota, where more than 22 Somali men have gone to Somalia to fight for the radical group al-Shabab. Several others have gone or tried to go to Syria to fight for the Islamic State group.

Following the Boston Marathon bombings in 2013, the Muslim Public Affairs Council in Washington has taken what it calls 鈥渁 proactive approach to identifying and intervening individuals who may be susceptible to violent extremism.鈥�

Authorities are still studying whether the killing of the three young Muslims in Chapel Hill, allegedly by Craig Hicks, was a hate crime.

On his Facebook page, he had written: 鈥淚 hate Islam just as much as christianity, but they have the right to worship in this country just as much as any others do.鈥�

In Hicks鈥� condo, police found four handguns, two shotguns and six rifles 鈥� one a military-style AR-15 carbine 鈥� and a large cache of ammunition. Although he apparently acted alone (possibly set off by a dispute with the victims over parking spaces), it鈥檚 unclear whether he can be thought of as a violent extremist 鈥渓one wolf鈥� in the usual sense 鈥� even though the specifics of the attack bear that out.

In a report last week 鈥撀犫�淎ge of the Wolf: A Study of the Rise of Lone Wolf and Leaderless Resistance Terrorism鈥� 鈥� the Southern Poverty Law Center (SPLC) examined more than 60 domestic terror incidents. Almost three-quarters of these were carried out or planned by a lone wolf, a single person acting without accomplices. Ninety percent of the incidents were the work of no more than two persons, according to the report.

The study, which included violence from both the radical right and homegrown jihadists from April 1, 2009 to Feb. 1, 2015, also found that a domestic terrorist attack or foiled attack occurred, on average, every 34 days.

鈥淚t鈥檚 important to recognize the trend away from organized groups committing acts of domestic terror,鈥� said Mark Potok, SPLC senior fellow and editor of the report. 鈥淎s Timothy McVeigh demonstrated with the Oklahoma City bombing, lone wolves and small cells of domestic terrorists can create massive carnage.鈥�

鈥淭he lone wolf鈥檚 chief asset is that no one else knows of his violent plans, which makes them exceedingly difficult to disrupt,鈥� Mr. Potok said. 鈥淚t is imperative that authorities, including those gathering at the White House next week, take this threat seriously. Anything less would be an invitation to disaster.鈥�