GHALLANAI: One man was killed in a landmine blast in Safi tehsil in Mohmand Agency, official sources said on Wednesday. The sources said that suspected militants had planted an explosive device near a checkpoint in Karkanai in Safi tehsil. The explosive went off early in the day, leaving one Khassadar Usman critically injured.He was shifted to hospital. However, he succumbed to his injuries on his way to hospital. The security forces cordoned off the area and launched a search operation. Meanwhile, security forces recovered a huge cache of mortar shells during a search operation in central parts of Kurram Agency, official sources said on Wednesday. The sources said the security forces launched a search operation in Jamal Mela and Zaya Syeed and recovered mortar shells and other explosive material.