The attacks, which began Tuesday night, left scores of people fleeing on foot from the four targeted villages about 180 kilometers south of Katsina city.
People were still burying victims at Marabar Kindo village when the attackers returned this afternoon and gunned down another seven villagers, said resident Adamu Inuwa. They also set fire to thatch-roofed huts, said Inuwa.
Kabiru Ismail of Maigora village said the first raid came late Tuesday and residents were continuing to recover bodies today of people who had fled into the bush with the gunmen in pursuit.
The chief imam of Maigora said two policemen responding to calls for help were among the dead. He and Ismail also said two men in military uniform were among the attackers.
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For months, the area has been terrorized by raids blamed on semi-nomadic Fulani herders attacking Hausa farmers. Both are Muslim.
Most Fulani-related violence in Nigeria is concentrated around central Plateau state, where Muslim herders are pitted against Christian farmers. Thousands have been killed in recent years.
Villagers attacked this week noted that in past raids in Katsina state the herders stole their belongings and especially cattle and sheep.
"This time they just killed people," Ismail said. "It's as if their mission is to wipe out entire villages.