“They have been killed, injured, abducted and forced to shoot and kill in one of the most brutal wars in recent history,” UNICEF said in a statement.
The Iraqi government is looking to declare victory by Ramadan, even if pockets of resistance remain in the Old City according to military officials
ISIS has lost most of Mosul since the offensive began in October and is now surrounded in the northwestern districts, including the historic Old City.
The Iraqi police accused ISIS of attacking their forces with chemical weapons against the militant crackdown undertaken by the State over the past six months.
With air and ground support from a US-led coalition, Iraqi government forces are trying to consolidate gains made in the east of the city since October.
The attack was the deadliest bombing in Iraq since US-led forces toppled Saddam Hussein 13 years ago.
The weekend attack has shown that ISIS is still capable of bombing Baghdad despite having lost control of their stronghold, Falluja last month.
Some die before even reaching the river, killed by sniper fire from Islamic State lines or by explosive devices along the roads.