(IRBIL, Iraq) — An American fighting with Kurdish forces against the Islamic State group in Syria has been killed in battle, authorities said Wednesday, making him likely the first U.S. citizen to die fighting alongside them against the extremists. Keith Broomfield, who was from Massachusetts, died June 3 in a battle in a Syrian village named Qentere, near the border town Kobani, said Nasser Haji, an official with a group of Kurdish fighters known as the YPG.