(CNN) One day after coalition airstrikes bombed Syrian government troops, warplanes made multiple attacks against rebel strongholds in eastern Aleppo on Sunday. Sunday's strikes turned up the pressure on a fragile ceasefire brokered between Washington and Moscow, now in its sixth day, and make the cloudy situation in war-torn Syria even grayer. It was not known who conducted Sunday's strikes, which the Syrian Observatory for Human Rights said were the first in Aleppo since the US-Russia-backed ceasefire took effect last Monday. At least one woman has died and many people have been wounded, some critically. Russia has said the US-led coalition airstrikes that mistakenly killed dozens of Syrian troops on Saturday -- prompting a diplomatic firestorm -- put the ceasefire in jeopardy.Australia says its warplanes were among a number of international aircraft in Saturday's operationISIS shot down a regime warplane in Deir Ezzor, killing a pilot, Syrian state media says
The terror group claimed responsibility for the shootdown in a statement circulated online by the _-affiliated Amaq agency.