Police repeatedly scuffled with protesters as Olympians and dignitaries carried the Olympic torch through snowy London during a chaotic relay on Sunday. Demonstrators tried to board a relay bus after five-time Olympic gold medallist rower Steve Redgrave launched procession at Wembley Stadium — presaging a number of clashes with police along the torch’s 50 km journey.In west London, a protester tried to grab the torch out of the hands of a TV presenter, forcing police to briefly stop the procession as officers detained the man. Another demonstrator tried to snuff out the flame with what appeared to be a fire extinguisher. Others in the crowd threw themselves at torchbearers running past in official Beijing 2010 Olympics tracksuits. The protests have forced officials to make unscheduled changes to the relay route, Metropolitan Police said. Thirty people have been arrested.British Prime Minister Gordon Brown briefly greeted the torch when it arrived outside his Downing Street residence as pro-Tibet demonstrators and police clashed yards away near Britain’s Parliament buildings.Demonstrators swelled in number near the spot where Chinese Ambassador Fu Ying had been expected to carry the Olympic torch. Instead, Fu emerged with the torch in the heart of London’s Chinatown, managing to jog unhindered before handing it over to the next participant. Along the route, hundreds of protesters chanted “Free Tibet!”, “Stop killing in Tibet!”, and “China, talk to Dalai Lama!”In London’s historic Bloomsbury area, police separated anti-China protesters from flag-waving Chinese who turned out to support their nation and the Olympics. “There was definitely a bit of an edge,” British tennis player Tim Henman, one of the torchbearers, said.Brown himself never handled the torch but watched as Olympic gold medalist Denise Lewis handed it to Paralympic hopeful Ali Jawad.Later, police hustled a torchbearer onto an official bus after he was surrounded by a 100 activists. The torch then traveled part of the journey toward St. Paul’s Cathedral by bus instead of on foot as planned, police said.Activists demonstrating against China’s human rights record and a recent crackdown on Tibet have been protesting along the torch route since the start of the flame’s 1,40,000-km odyssey from Greece.