RIO DE JANEIRO, Aug. 21 (Xinhua) -- Jamaican sprint legend Usain Bolt expressed his gratitude to Brazilian fans as he signed off from his last Olympic Games.

Bolt, who celebrated his 30th birthday on Sunday, clinched his third successive sweep of Olympic sprint titles here by winning the 100m, 200m and 4x100m gold medals.

"We came, we saw, we conquered," Bolt wrote in Portuguese on Twitter, adding: "Rio, my love for you is infinite."

Earlier, Bolt thanked his 4.38 million followers for their birthday messages.

"Thanks for all the birthday wishes my peeps... I am beyond blessed to share my 30th birthday with you all," he said.

Bolt confirmed his standing as the most successful sprinter of all time in Rio, taking his overall Olympic gold medal tally to nine.

He said several times during the Rio Games that he would not compete again at the Olympics.