"The capacity of the boat was 50 people, but it sank because the number of people aboard reached around 200", Iraqi lawmaker Abdel-Rehim al-Shamari said.
Adel Abdul-Mahdi, the Iraqi prime minister, ordered an investigation and expressed deep condolences to the families of the victims.
The boat was ferrying people to a man-made island used as a recreational area by families, according to one witness. Khalil said the ferry had been overloaded.
Iraqi people walk near the Tigris River in Mosul.
The tragedy was the latest setback for a city that has struggled to rebuild after it became, in 2017, the center of the bloodiest battle against the Islamic State in Iraq.
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The final death toll remains unclear, with some sources saying up to 60 people may have died. Iraq's interior ministry said 94 people had died in the incident and 55 people were rescued, AFP reported.
The river swelled further after a rainy season that brought more precipitation than in previous years.
Emergency rescue teams on March 21, 2019 at the site where a ferry sank in Iraq's Tigris river.
Hundreds of people who had flocked to the forested area for the first days of spring gathered on the river banks as the disaster unfolded. "With pain and sadness, we follow up the ferry incident in the city of Mosul, which killed dozens of innocent women, men and children", Abdul Mahdi said in a statement issued by his office.
"I was standing near the river back when suddenly the ferry started to tilt left and right, and passengers began screaming before it capsized", said Mohamed Masoud, a local civil servant.