Talk to any major western leader and they will tell you Pakistan is a key ally in the war on terror. If that's true this week the President of Pakistan Asif Ali Zardari had some bad news for his strategic partners. He told the world his police force and army has been unable to control Islamic extremists in his country, warning Pakistan had under-estimated the strength of the Taliban. To judge just how bad the situation really is reporter MATTHEW CARNEY has travelled to key areas of Pakistan, teaming up with a senior local journalist to investigate the Taliban's expanding reign of terror.