UPDATE 3-Olympics-Cycling-Pajon wins Colombia's first gold

(Adds quotes, details)

LONDON, Aug 10 (Reuters) - Mariana Pajon, Colombia's flag

bearer at the opening ceremony, earned her country their first

gold medal of the London Games when she thundered to victory in

the women's BMX event on Friday.

Pajon, also the second Colombian to win an Olympic gold

after weightlifter Maria Isabel Urrutia prevailed in Sydney in

2000, had dominated her three semi-final runs in awe-inspiring

fashion.

She carried the momentum in the final where she led the

eight-rider strong field after the first bend and never looked

back, something she was happy to do at a news conference later.

"I started gymnastics when I was five, but I started BMX

when I was three," she recalled, beaming with joy.

"I was doing gymnastics, BMX and cart racing. However BMX

wasn't at the Olympics and I wanted to be here, then BMX was

introduced in Beijing and I started training.

"I started racing when I was three and I realised I could do

this and do it well. I started winning at four with the boys and

won my first world title at eight."

New Zealand's Sarah Walker took silver and Dutchwoman Laura

Smulders claimed bronze while local British hopeful Shanaze

Reade had to settle for sixth.

She finished just behind Caroline Buchanan of Australia, the

BMX time trial world champion.

"I can't believe it," said Pajon, who blew kisses to the

capacity crowd. "It's like a dream come true. I've been trying

to win this my whole life. I just wanted go out of the gate and

win it. It's unbelievable."

On a very tricky course, Pajon once again used her explosive

start to take the early lead, which proved unassailable for her

rivals.

"I have tried so hard for it and I just did it," she said.

"I felt really strong, I had really good gates and that's it. I

really had fun on it. I have to wake up tomorrow and realise

what I have just won."

(Reporting by Julien Pretot; Editing by Mark Meadows and

Michael Holden)