08/11/2012 07:01 EDT | Updated 10/11/2012 05:12 EDT

Bolt leads Jamaica to record in 4x100 relay, Canada loses bronze in DQ

LONDON - As Usain Bolt and his teammates celebrated smashing the world record in the men's 4x100-metre relay, Canada's team sat on the track in tears.

There was more heartbreak for Canadian athletes at the London Olympics on Saturday.

A bronze-medal run was nullified by a disqualification after Canadian runner Jared Connaughton committed a lane violation.

The scoreboard had displayed a time of 38.07 seconds for Canada as anchor runner Justyn Warner of Markham, Ont., crossed the finish line. But instead of proudly taking the Maple Leaf for a victory lap, the team was instead devastated by news of its disqualification.

"I take full responsibility," a distraught Connaughton said. "I'm captain of this team and these guys are like my little brothers"

There was no such contrition for Bolt, the self-described "legend," who certainly made his mark on these Games. Bolt led his talented team to victory in a world-record time of 36.84 seconds and picked up his third gold medal in the process. He also won the 100-metre and 200-metre events.

"It's amazing. It's been wonderful," Bolt said in an interview shown on the scoreboard.

Talking to the spectators, he said: "You guys are wonderful. Thanks for the support. I love you guys."

The United States finished second, while Trinidad and Tobago was bumped up to third after Canada's disqualification.

It was also another successful day at the track for the host nation, as Britain's Mo Farah's late charge gave him the gold medal in the men's 5,000 metres. Farah has been the star long-distance runner of these Games, also taking gold in the 10,000 earlier.

"The crowd were amazing, they made an unbelievable noise," Farah said. "Two gold medals, who would have thought that?"

His competitors, too, felt the power of the home fans.

"The crowd helped him. He ran 100 per cent and they added another 10," said fourth-place finisher Bernard Lagat of the United States. "So you had a guy running at 110 per cent."

Canada's disappointment on the track was the latest setback for Canada in a difficult Games. Aside from some disappointing results from medal hopefuls such as shot putter Dyaln Armstrong, boxer Mary Spencer and cyclist Catherine Pendrel, the team has also had its share of official decisions go against them.

Canada's equestrian team had a horse disqualified with a scratch on its leg and boxer Custio Clayton lost a close decision to a British boxer in a quarter-final bout.

Perhaps most galling was the officiating in Canada's 4-3 semifinal loss to the United States in the women's soccer semifinals. A controversial call from the Norwegian referee led to an American goal late in the game, which Canada was leading 3-2 at the time.

Still, Canada enters the final day of competition tied with Ukraine at 12th in the overall medal standings after Halifax native Mark de Jong won a bronze in the men's K-1 200-metre kayak. That raised Canada's medal count to 18 — one gold, five silver and 12 bronze.

The Canadian Olympic Committee set a top-12 finish as its goal before the Games.