KANDAHAR, Afghanistan – More than 400 inmates — many of them Taliban insurgents — escaped from the main prison in the southern Afghan city of Kandahar overnight through an underground tunnel, an official said Monday. The massive jailbreak in Kandahar, the focus of much of the international military effort to defeat the insurgency, is a reminder that the Afghan government is still weak and easily thwarted in the south, despite an influx of international troops, funding and advisers. The escape comes after years of security upgrades and tightened procedures at the 1,200-inmate Sarposa Prison following a brazen 2008 Taliban attack...