Intro:

Kenya's reigning London Marathon champion Wilson Kipsang insists he and his team-mates are clean after questions over the country's doping record are raised at a press conference on Thursday ahead of this year's race.

Script:

SOUNDBITE (English), Wilson Kipsang (on questions over Kenya's doping record)

"I think that's a big question and it needs a lot of discussion which I think many of these guys have been tested all through and I think the results have been negative so I think they are clean when it comes to the doping issue. But I think in Kenya, we have been hearing so many things which are going on... but I think - I don't want to comment so much because, it's a big story which you find that some of things we might not have answers because we have departments who understood doping. But we know, since we are speaking, as top guys, we are really forgetting so much for a clean sport. Because we are clean. And for the few who have maybe have been to have doped, we are saying that we are against what they have done and we are not supporting it in any way."

SOUNDBITE (English), Wilson Kipsang (on his aim for this year's London Marathon)

"Yeah, I think my main aim on Sunday is not really the world record but retaining the title, to defend and running a good time."