Chinese police step up security as Olympics opening ceremony approaches
Updated on 05 August 2008
Beijing security is tightened after yesterday's grenade attack on police in western China.
In an eventful day, George Bush raised the issue of human rights in China as he travelled to the far east.
The United States cycling team arrived in China wearing respiratory masks guaranteed to cause political offence in some quarters.
And there has been another doping scandal, this time involving two Russians.
