Per WGN 9 News, Turkey’s NTV television is quoting Istanbul’s governor as saying 28 people were killed in the attack at the city’s airport and some 60 people wounded.
Governor Vasip Sahin also told the channel that three suicide bombers carried out the attack Tuesday.
Officials had previously said one or two attackers had blown themselves up at the entrance to the international terminal at the airport after police fired at them.
Turkish airports have security checks at both at the entrance of terminal buildings and then later before entry to departure gates.
Turkey has suffered several bombings in recent months linked to Kurdish or Islamic State group militants.