American officials say one idea being considered by the U.S. side is a map that would be drawn up with the Russians laying out “safe zones” where civilians and members of moderate opposition groups covered by the truce could find shelter from persistent government attacks. [...] rebels on Monday lobbed rockets into government-held areas in the western part of the city while government helicopters dropped crude “barrel bombs” on opposition-held areas in Aleppo and surrounding villages, according to the Syrian Observatory for Human Rights. [...] Monday, the Turkish military said artillery shelling and drone attacks by the U.S.-led coalition struck Islamic State positions in Syria and killed a total of 63 militants. Four drones deployed from the Incirlik air base, a launching point for U.S.-led coalition forces in southern Turkey, took part in the operation and killed 29 militants. The air strikes were informed by intelligence gathered by the Turkish army, the private Dogan news agency reported.