The truce has been largely holding since the start of September, allowing the two sides to extend a pullback of weapons. Ukrainian Defence Minister Stepan Poltorak said the attack took place on October 13 when separatists fired grenade launchers at Ukrainian forces near Avdiivka, a government-controlled town just north of the city of Donetsk. Poltorak said details were still sketchy and suggested a rogue group not controlled by militant leaders could be behind the attack. The withdrawal of weapons from the front line was agreed on condition that both sides fully respect the cease-fire.