At least six people were killed and 10 others injured as mortar shell hit civilians in Pakistan's Khyber tribal area today. The private channel DAWN News said, some unidentified persons fired mortar shell from an unknown location, which landed in Landi Kotal Bazaar, leaving six persons dead. The injured were shifted to a nearby hospital. Meanwhile, clashes erupted in the Landi Kotal tehsil of Khyber Agency after some unidentified persons attacked a security check post. Sources said the clashes between security force and militants were still going on in the lawless tribal region along Pakistan's border with Afghanistan