The wounded are rushed to hospital after a suicide bomber kills at least 20 people in Pakistan.<br/> Police say the attack happened during funeral prayers.<br/> The Pakistani Taliban have stepped up attacks on pro-government tribes recently.<br/> Taliban militants are currently holding more than 20 young men hostage in an area straddling the Afghan border.<br/> They're demanding the release of prisoners and an end to tribal support for offensives against them.<br/> The U.S.-backed government have persuaded some groups to take up arms against the militants.<br/> Lily Grimes, Reuters