The U.S. Treasury Department warned in a new report that domestic violent extremists' normal transactional activity and use of legal fundraising methods present a "challenge" to financial institutions and authorities efforts to detect and police them, reports the Wall Street Journal. Marking the first time the Treasury had analyzed the funding methods used by domestic extremists, a relatively new priority area for the government, the report also called out crowdfunding platforms as a source of income for the extremists that have become "a necessity rather than a convenience." The Treasury, which intends to release a national strategy for combating terrorist financing in the coming weeks, said it didn't include in its risk assessment individuals engaged solely in activities protected by the First Amendment and noted that many domestic extremists fund their own activity.