I want to know the answer to the following question:
Three protester climbed what to hang two banners on April 7, 2008?
All the background I'm provided with is that "Among them was San Francisco resident Laurel Sutherlin, who spoke to the local TV station KPIX-CBS5 live from a cellphone, urging the International Olympic Committee to ask China not to allow the torch to go through Tibet.". Is that enough to answer the question?