(KUNA) -- Suspected Taliban militants Wednesday blew up a hairdresser shop in a Pakistani tribal agency and in another incident beheaded Afghan refugee for spying on them for US troops, said officials. Militants hurled a hand-grenade at a hairdresser shop in Dera Adam Khel tribal agency, causing no life loss but damaging it badly, security officials told KUNA. They said owner of the shop had been receiving threatening letters from Taliban, warning him to close down his business as shaving off beards is un-Islamic.In a related incident, they said further, militants kidnapped and beheaded an Afghan refugee in North Waziristan tribal agency on charges of spying for US troops in Afghanistan. His body was found Wednesday near a military checkpost at Gorrwak village, they added.