At least four people were killed and 20 injured on Saturday in a bomb blast in Dera Ismail Khan at Khyber-Pakhtunkhwa, Pakistan. A bomb planted in a trash can exploded near a morning procession, police sources said. Eight-to-ten kilograms of explosives were used in the blast, they added. The injured were shifted to local hospital. Moreover, police cordoned off the area soon after the attack and investigation is underway.