The scores of militants who arrived on motorcycles or by car "opened fire instantly, which forced residents to flee. They shot a number of people", Modu Balumi, a resident of Kukuwa-Gari, told AFP.
Many residents, who tried to flee, plunged into the river which is full from the rain, and drowned, Reuters reported.
The latest tally, Balumi said, showed a total of 150 people either shot dead or drowned in the attack. "The gunmen deliberately killed a fisherman who tried to save drowning residents of the village."
This is just the most recent attack on the Kukuwa-Gari villagers by Boko Haram, which began to forge an alliance with the Islamic State in Iraq and the Levant (ISIL) terrorist group in 2014.
On 29 July, according to a member of the local government council, 32 Boko Haram militants on motorcycles raided the village at 10:30 pm, killing 10 people. The attackers also "burnt more than half of the village, including food silos and livestock", the local government source said at the time.