The most prominent forum for men who consider themselves involuntarily celibate or “incels” has become significantly more radicalized over the past year and a half and is seeking to normalize child rape, a new report says.

The report, by the Center for Countering Digital Hate’s new Quant Lab, is the culmination of an investigation that analyzed more than 1 million posts on the site. It found a marked spike in conversations about mass murder and growing approval of sexually assaulting prepubescent girls.