A suicide bomber blew himself up inside a tent of security guards in eastern Afghanistan Sunday, killing one of them and injuring six more, officials said. The attacker, who had strapped explosives to his body, detonated after entering the tent used by guards in charge of security for a road construction company in the province of Khost, officials said. "One guard was killed and six others were injured in the suicide bombing. They were from a private security company," Gul Qasim Jihadyar, the district chief of Yaqoubai, where the bombing took place, told Agencies.