Two suicide bombers wearing police uniforms blew themselves up at an Afghan police headquarters Saturday, killing at least 12 officers and wounding 16, officials said. The blasts occurred within 20 minutes of each other in Paktika province, said Gen. Daud Andarabi, the spokesman for the regional police commander in southeastern Afghanistan. Nawab Waziry, the head of Paktikas provincial council, said both men wore police uniforms and made it through three security gates before reaching the main building on the police compound. One attacker denoted his explosives inside the police headquarters building, the other blew himself near the entrance, he said.