The incessant weeks-long bombardment of Mosul began last October 17 claimed the lives of 762 civilians and wounded 1, 279 including hundreds of women and children.
Newspapers quoted the observatory as saying that thousands of civilians are still trapped in Mosul, especially in the western side which is under heavy bombardment by the US-led coalition as well as a ground offensive.
They are facing dreadful humanitarian conditions including shortage in foodstuff, electricity, drinking water and medical supplies.
Newspapers closely observing the situation in Mosul reported that 90 civilians, including 32 children, were killed and 140 others injured over the past three days.
On Monday, jets of US-led coalition bombed Al-Shifaa neighborhood in western Mosul, resulting in hundreds of deaths and injuries.
On February 19, Prime Minister Haidar al-Abadi announced the launch of the next phase of the operation to root out the militants from their stronghold, an effort that began four months ago.
Iraqi soldiers advanced toward the airport south of Mosul on February 20, battling in the face of reported tough resistance from IS terrorists desperate to fight for their self-declared capital in Iraq.