What next for divided Mexico?

After left-wing lawmakers protesting at alleged election fraud forced outgoing Mexican President Vicente Fox to abandon a key speech, the BBC's Duncan Kennedy asks just how far the protests could go.

Will they or won't they? It had been the hot political gossip of the week in Mexico City, a place that has turned speculation and rumour almost into a science.

Everyone was talking about whether the left-wing MPs would try to disrupt President Fox's last state of the nation speech or whether they would just sit in irreverent silence.

In the end they could not resist the opportunity.

On national television they decided their moment had come - the chance to secure some sort of leftist victory, however short-lived, over right wingers.

As stunts go, it was pretty impressive and quite well organised.