Tiananmen Square protesters recount massacre 30 years later

The world is marking 30 years since the Tiananmen Square massacre in Beijing, when Chinese troops opened fire on pro-democracy demonstrations in 1989. Now, China has censored all mention of the bloodshed. CBS News foreign correspondent Elizabeth Palmer spoke with Tiananmen Square protester Wu'er Kaixi, and fellow protester and author Shen Tong joined CBSN to discuss what they witnessed.