COURTESY: RT's RUPTLY video agency, NO RE-UPLOAD, NO REUSE - FOR LICENSING, PLEASE, CONTACT br Riot police used pepper spray, tear gas and flash grenades on protesters denouncing the inauguration of US President Donald Trump, in Washington DC, Friday. At least 100 protesters have been arrested so far, after the demonstration turned violent with protesters throwing rocks at police and setting a limousine on fire. br br RT LIVE br Subscribe to RT! br Like us on Facebook Follow us on Twitter Follow us on Instagram Follow us on Google+ Listen to us on Soundcloud: br RT (Russia Today) is a global news network broadcasting from Moscow and Washington studios. RT is the first news channel to break the 1 billion YouTube views benchmark.