Gunmen killed a Shia Muslim in Dera Ismail Khan on Tuesday, police said, in at least the second sectarian-linked attack to blight the country in 48 hours. "Unidentified gunmen shot dead Athar Hussain Shah on the Dayal road while he was returning to town from his nearby farm and then escaped," local police official Tauqir Abbas said. Abbas said the victim was the son of a caretaker at a local Shia mosque. "It seems to be a sectarian killing," the official said. There was no immediate claim of responsibility for the attack.