NEW : Five people detained in connection with deadly attack , police say . China censors video of car that crashed into Tiananmen Square , killing 5 . China 's state broadcaster , CCTV , showed no footage of the incident . Chinese diaspora group says it 's too early to assign blame .
NEW : Five people detained in connection with deadly attack , police say . China censors video of car that crashed into Tiananmen Square , killing 5 . Chinese diaspora group says it 's too early to assign blame .