Stay calm, don't touch it, move away quickly and send a text message to police, possibly with a photograph. That's how police want people to respond when they see something that looks like a bag with explosives.

The advice is part of a new anti-terrorism manual the Ministry of Public Security has prepared in the run-up to the Beijing Olympic Games.

It is the first government warning that addresses the public and tells it how to tackle a situation in case of a terrorist attack.