KABUL, Afghanistan (AP) — Three NATO troops were killed Friday in Afghanistan in a surge of attacks that raised the death toll to 17 in three days for international troops in the country. One service member died Friday in an insurgent attack in the east and another was killed by a roadside bomb in southern Afghanistan, an alliance statement said. It did not give nationalities or exact locations of the attacks. On Thursday, eight NATO troops were killed in a spate of attacks, including four separate roadside bombings. It has been the deadliest year for international forces in the nine-year Afghan conflict. Troop numbers have been ramped up to turn the screws on insurgents and casualties have mounted. The escalating toll — more than 2,020 NATO deaths since the 2001 U.S.-led invasion — has shaken the commitment of many alliance countries, with calls growing to start drawing down forces quickly. Getty Images photographer Scott Olson is with the Marines of India Battery, 3rd Battalion, 12th Marine Regiment who are responsible for securing the area near the Kajaki Dam on the Helmand River.