Lord Mandelson has had a cup of green liquid thrown in his face by an environmental protester. Campaign group Plane Stupid said 29-year-old activist Leila Deen carried out the stunt as the Business Secretary arrived at the launch of the Government's low carbon economy summit. Lord Mandelson said: "She was so busy throwing what seemed like green soup or something in my face that she failed to tell me what the protest was about, but as you can see thankfully is wasn't paint and I've come through it intact." Ms Deen, who calmly walked away after the incident, said: "The only thing green about Peter Mandelson is the slime coursing through his veins. "That Mandelson is trying to make political capital out of climate change just days after reports that he met with BAA's top lobbyists to push through the third runway is an insult to my generation," Ms Deen accused Lord Mandelson of only representing business interests, adding that he was an unelected Government representative. Lord Mandelson quickly walked into the building where the summit is being held after the incident and emerged a few minutes later, minus his coat. Prime Minister Gordon Brown is also due to attend the summit along with other Government representatives and business leaders to discuss the "greening" of industry and opportunities for new jobs. Plane Stupid has launched a series of high profile stunts in recent years against the Government's environmental policies.