QUETTA - A man was killed and another sustained wounds in a bomb blast in Katan Bridge area of Khuzdar, about 360-kilometre southeast of Quetta, on Friday.According to police, explosive material, fitted to a donkey cart, exploded at Katan Bridge area of Khuzdar, killing its driver on the spot and injuring a passer-by. “Explosives were fixed to donkey cart and the apparent target of bomb attack was a security checkpoint as the blast occurred when donkey cart crossed the post,” sources in police said.Police rushed to the spot and cordoned off the area. The deceased and injured were taken to the District Headquarters Hospital. The deceased was identified as Muhammad Ibrahim. Meanwhile, explosives planted with a railway track near Sariab Road Quetta exploded, damaging the track partially.