The Syrian regime has launched a massive crackdown against protestors demanding political reform in the country. The killing of protestors in 14 separate towns on April 22 heralded a dramatic escalation in violence. In an attempt to pre-empt further protests, the government ordered (25 April) tanks to move in to the city of Deera, which has been at the centre of unrest in the last few weeks. Human rights groups have estimated that 400 people have been killed by security forces since protests began five weeks ago.