India, Sept. 23 -- Nearly 870 kg of explosives were used in a suicide blast in northwest Pakistan's Kohat district last week that killed 21 people, including 16 policemen, authorities said on Tuesday. Militants detonated an explosives-laden vehicle at a mosque on September 18 during Friday prayers and stormed nearby police facilities in Kohat district of the restive Khyber Pakhtunkhwa province. The explosion killed 21 people, including 16 policemen, and injured 103 others, most of whom were police personnel. A bomb disposal unit examined the blast site, collected evidence, including the nature and quantity of explosives used, and submitted a detailed report to the Central Police Office on Tuesday. According to the report, 869 kilograms of...