they try to get a room with a view of tahrir square. >> they said they have orders from state securityot to sell any rooms overlooking tahrir. so we said okay and we settled for a nile view room. >> while organizing their coverage of the day's events, nora notices something happening outside their window. she grabs her camera and begins to film a chaotic scene coming into view across the nile river. >> we heard many bombs. and we couldn't see anything. and the bombs were just going and going and going. and then we saw smoke coming out from the other side of the river. >> nora's footage shows a massive crowd of protesters engaged in a growing battle with police. >> the people wanted to get across the bridge, across the nile to tahrir square to join the revolutionaries in tahrir square. >> a line of riot police, led by two armored vehicles, races across to meet the crowd. >> and the riot police and their armored vehicles were determined to push them back. and it literally became a battle for this bridge. >> protesters determined, marched forward on foot. police halt the crowd about halfw

. >> narrator: the arab spring surged out of tunisia into tahrir square and on to tripoli., these mass demonstrations overthrowing powerful dictators must have been worrying. >> it was the first stage of his coming to understanding that he could never quit the post, because the destiny of gaddafi could be waiting for him. >> narrator: in 2011, when vladimir putin announced he would run again for russia's presidency, the response was mass demonstrations in moscow's streets, protests which had to be put down by police. >> there's never been a good succession model in the soviet union or in russia, and he's very worried about how he will leave power. he doesn't want to leave in a coffin, he doesn't want to go to a jail cell. he's got so many guilty secrets, so much money's been stolen, and so many people have been killed that he doesn't really trust anyone to keep him safe if he steps down from power. so in a way, he's both the master of the kremlin but also a prisoner in it. (russian national anthem playing) >> narrator: in 2012, putin moved medvedev aside and took back the p

the next day clinton met with egypt's transitional lead anywhere cairo and walked through tahrir squareh abadeen. turi's proposal, a $267 million contract was working its way through official channels. >> my application was submitted on the 12th. these brokers then, through their relationship with the tnc provided the application information to ms. clinton via the tnc council when she was in cairo. that's what was told to me, in an email. >> turi showed fox emails from april 6 and 7, 0u 11. that he exchanged with chris stevens' personal email account. alerting him to his application to sell weapons. stevens replied with a thank you. and i'll keep it in mind and share it with my colleagues in washington. >> he is the point guy now. >> coming up, what does this email from secretary clinton tell us about her secret strategy to arm the libyan rebels? [announcer:] what if one stalk of broccoli could protect you from cancer? what if one push up could prevent heart disease? [man grunts] one wishful thinking, right? but there is one step you can take to help prevent another serious disease- pne

. >> from tahrir square to occupy wall street, video seen around the world. >> medic!the fires of freedom and sparked political change. >> ever since then, the camera