The Federal Bureau of Investigation (FBI) has launched a probe to find out if any foreign actors, including governments and groups, funded the rioters who attacked the US Capitol building in Washington D.C. on January 6, according to a news report published on Sunday.

The NBC News report, which cited a former and a current FBI official, said the agency "is examining payments of $500,000 in bitcoin, apparently by a French national, to key figures and groups in the alt-right before the riot".