Canadian troops from the NATO-led coalition walk past the wreckage of several Afghan National Police vehicles that were recently destroyed by roadside bombs in Zhari and Panjwaii districts July 8, 2007. Canadian police and soldiers are mentoring and training their counterparts in Afghanistan and trying to learn more about improvised explosive devices of the kind that killed six Canadian soldiers in Panjwaii last week and more than 20 Afghan police in the last 20 days.