Today's anniversary in China will be censored online

Images of candles, flowers or a single banana in front of four apples in a line. These are among the images that are being erased from the internet in China today. That's because it's June 4, and also the 36th anniversary of the bloody crackdown in Beijing against the massive student-led protests at Tiananmen Square. The Chinese government has never come clean about what happened that day. And after all these years, China goes to extraordinary lengths to suppress just about any online reference to those events. The World's Matthew Bell reports.