Opinion | 'Tank Man' photographer: 'I will never forget the laughter'

Hundreds, if not thousands, of people were killed in June 1989, when Chinese soldiers open fired on unarmed civilians in Beijing’s Tiananmen Square. Jeff Widener’s iconic ‘Tank Man’ photograph came to symbolize the brutality of the crackdown. Thirty years later, Widener shares new details about his experience covering the massacre.