The reported attacks by the Islamists targeted the Michika area in northeastern Adamawa state, where bodies reportedly littered the streets in several villages.
The bloodshed in northeast Nigeria has reached unprecedented levels in recent weeks, raising questions about security for general elections set for February 14.
The head of a European Union election monitoring mission, Santiago Fisas, said staff deployed to observe polling in Africa's most populous country would not even attempt to travel to the northeast.
Adamu Kamale, who represents the Michika district in the Adamawa state government, also in the northeast, said Boko Haram gunmen had been going "door-to-door, killing people, including the old" for the past two weeks.
It was not immediately clear what sparked the latest alleged atrocities.
The insurgents, who are blamed for more than 13,000 deaths since 2009, have been in control of Michika for roughly five months.
Many had escaped to Adamawa's capital Yola, where hundreds of thousands have previously sought refuge, while others have been hiding in the mountain range that borders Cameroon.
"Dead bodies litter villages... The attackers slaughter people like animals," he said.
In other areas under Boko Haram's control, however, the attacks had abated and Kamale struggled to understand that latest unrest.
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