Usain Bolt tweeted a picture of himself with three Swedish women handballers.

Usain Bolt tweeted a picture of himself with three Swedish women handballers. Photo: @usainbolt

Jamaica's Usain Bolt warned he was "ready to go again" on Monday in search of more Olympic gold after celebrating into the small hours following his classic 100m win.

Bolt, who answered his critics by running 9.63sec, the second-fastest time ever behind his own world record, tweeted a picture overnight of himself with three Swedish women handballers in the athletes' village.

Bolt later posted another picture of himself sitting on his unmade bed and holding up three fingers.

Bolt later posted another picture of himself sitting on his unmade bed and holding up three fingers. Photo: @usainbolt

But by mid-afternoon, he posted another picture of him sitting on his unmade bed and holding up three fingers, representing the three sprint titles he is defending in London.

"I am up and ready to go again," was the message.

Bolt's one-two finish with teammate Yohan Blake, celebrated wildly in Jamaica during parties for the country's independence day, wrote his name in the list of athletics legends.

The showboating, 1.96m runner became the first man since US great Carl Lewis to win the 100m at consecutive Games. Lewis claimed his second when Canada's Ben Johnson was disqualified for doping.

Bolt will now attempt to become the first man to win both the 100m and 200m twice in a row, and he will also defend Jamaica's title in the 4x100m relay. The 200m heats are on Tuesday.

Former world judo champion Edith Bosch said she tackled a man who threw a plastic bottle onto the track, landing just behind Blake, as the 100m started. The man, a vending-machine technician from northern England, was later arrested.

"I got furious and gave him a hard slap on the back," said Bosch.

Italy's reigning 50km walk champion Alex Schwazer has been withdrawn from the Olympics for failing a drugs test, a source with knowledge of the case said.

Separately, American judoka Nicholas Delpopolo was kicked out after admitting eating food spiked with marijuana - although he said it was a "mistake". Delpopolo, 23, had finished seventh in the men's 73kg category.

"The athlete explained his positive test was caused by his inadvertent consumption of food [prior to his leaving for the London Olympic Games] that he did not realise had been baked with marijuana," the IOC said.

"The athlete apologised to the USOC [United States Olympic Committee], his teammates and his fans and indicated that he was embarrassed by his mistake."

AFP