Two attackers with suicide vests detonated their explosives at the entrance of Istanbul’s Ataturk International Airport, killing at least 28 people and injuring at least 60, Turkish officials said Tuesday night. Police shot at the two attackers as they approached. The attackers then detonated their bombs, the officials said. Both Kurdish and Islamic State militants have carried out bomb attacks in Turkey. The Ataturk International Airport is one of the world’s busiest.