LONDON, England (AP) — Usain Bolt finally delivered what he had denied fans with his previous two victories at the London Games — a world record.

The crowds packing the main stadium last night erupted in wild cheers as Bolt took the baton from Yohan Blake and ran across the finish line to help Jamaica to victory in a record 36.84 seconds in the 4×100-metre relay. He added that gold to the ones he earned in the 100m and 200m.

Spectators loved it, and chanted, “We want Bolt. We want Bolt!” as the runner shook his fingers, setting off a crowd wave around both tiers of the 80,000-capacity stadium.

The United States got the silver in 37.04, matching the old record that Bolt helped set at last year’s World Championships. Trinidad & Tobago took the bronze in 38.12 after Canada, who were third across the line, were disqualified for running outside their lane.

Bolt’s latest victory makes him the first person to win golds in the 100 and 200 metres and the 4×100-metre relay at consecutive Olympic games. But while he won all three with world-record times in Beijing, his victories in the two individual sprints in London were outside the world marks he set in 2009.

Bolt’s victory followed that of Briton Mo Farah, who added a second Olympic gold to his collection, winning the 5,000 metres as a frenzied home crowd cheered.

The Somali-born runner, who last Saturday gave Britain their third athletics medal of the night when he won the 10,000 metres, delighted the public by kissing the ground then doing a few situps. He ran a time of 13 minutes, 41.66 seconds. Dejen Gebremeskel of Ethiopia took silver and Thomas Longosiwa of Kenya collected bronze.

Moments later, Caster Semenya from South Africa managed a silver in her Olympic debut in the 800-metre race three years after being forced to undergo gender tests.

She was last for most of the race and sped up with 250 metres to go, but could not pass world champion Mariya Savinova of Russia, who took gold. Russia also took the bronze with Ekaterina Poistogova.

Savinova finished the race in a season’s-best one minute, 56.19 seconds, beating Semenya by 1.04 seconds.

In what turned out to be a good night for Russia, Anna Chicherova took the gold medal in women’s high jump.

Allyson Felix gave her 4x400m relay team a big lead halfway to give the Americans another gold — her third of the London Games after the 200 and 4×100 relay. Teammate Sanya Richards-Ross added this medal to her 400-metre gold.

In other medals yesterday, Russia swept the gold medals in race walking: Sergei Kirdyapkin of Russia won the men’s 50-kilometre walk, breaking the Olympic record by more than a minute, and Elena Lashmanova of Russia in the 20-kilometre women’s race in a world record.

Lashmanova overtook defending champion and fellow Russian Olga Kaniskina in the last metres of the race women’s 20-kilometre race walk to win gold at the London Games and break the world record in the event.

The 20-year-old Lashmanova was behind her Russian teammate throughout the race that Kaniskina has led until the finish line was within sight. Lashmanova stepped up and clocked one hour 25 minutes and two seconds, seven seconds ahead of the three-time world champion Kaniskina.

Qieyang Shenjie of China claimed bronze. Qieyang is the first Tibetan athlete China have ever fielded in the Olympic Games. She finished 14 seconds behind the winner.

David Boudia gave the United States their first diving gold medal since 2000 when he clinched victory with his last dive in the men’s 10-metre platform. Qiu Bo of China was second and Britain’s Tom Daley settled for the bronze after leading going into the final dive in front of a raucous home crowd that included soccer star David Beckham and two of his sons.

Mexico won their first gold of the games when Oribe Peralta scored after just 29 seconds and then added another in the second half to help his side beat Brazil 2-1, the country’s first Olympic football title.

In other team sports, Brazil won a second straight Olympic gold medal in women’s volleyball, the US won their fifth straight Olympic gold medal in women’s basketball, Norway took a gold in women’s team handball and Germany won a gold in men’s field hockey.

Another Olympian known as the “Usain Bolt on Water” — British sprint kayaker Ed McKeever — won the first gold medal of 32 to be presented yesterday. McKeever won the inaugural 200-metre K-1 sprint event at Dorney Lake west of London.

In sailing, Tamara Echegoyen, Angela Pumariega and Sofia Toro of Spain won gold in women’s match racing in the best-of-five final over Australia.

In other finals yesterday, Keshorn Walcott of Trinidad & Tobago won a gold medal in men’s javelin, and David Svoboda of the Czech Republic took gold in men’s modern pentathlon.

With the end of athletics yesterday, the stadium will make way for today’s closing ceremony. The early word is that the 80,000-seat venue will be transformed into a giant jukebox of British pop, with The Spice Girls and The Who among the acts set to perform.

In other Olympic news, a female Syrian athlete has been kicked out of the Games for doping. The IOC said 400-metre hurdler Ghfran Almouhamad tested positive for the banned stimulant methylhexaneamine on August 3. The backup “B” sample confirmed the positive finding.

The 23-year-old athlete finished eighth and last in her first-round heat on August 5.