“It is not an exaggeration to say that we live in an age of extremist mass killings,” the report from the group’s Center on Extremism says. There were shootings inspired by the rise of the Islamic State group as well as a handful targeting police officers after civilian shootings and others linked to the increasing promotion of violence by white supremacists, said Mark Pitcavage, a senior research fellow at the ADL’s Center on Extremism. The increase in the number of mass killing attempts, meanwhile, is one of the most alarming trends in recent years, said Center on Extremism Vice President Oren Segal