Three persons, including a local political leader, were killed on Saturday in a remote-controlled explosion in northwest Pakistan, police said.Adalat Khan, leader of Qaumi Watan Party, was targeted with a remote control device when he was on his way to a court in Buner district in Khyber-Pakthunkhwa province.Two others were also injured in the blast. No group has yet claimed responsibility for the attack.In a separate incident, one person was killed in a powerful explosion in Peshawar.