Another bomb attack in Pakistan

At least 12 people have died in Peshawar, Pakistan after a suicide bomber attacked a police investigation bureau close to a Pakistani army garrison. Security has been tightened nationwide after about 40 people were killed in Lahore and the north-west on Thursday. Those attacks were the latest in a recent wave of brazen militant assaults across the country. The World’s Katy Clark looks at the strategy of the insurgents.