Boko Haram fighters killed at least 43 farm workers and injured six as they worked in rice fields near the northeast Nigerian city of Maiduguri on Saturday, anti-jihadist militia told AFP.
The assailants tied up the agricultural workers and slit their throats in the village of Koshobe, the militia said.
"We have recovered 43 dead bodies, all of them slaughtered, along with six others with serious injuries," said militia leader Babakura Kolo, who helped the survivors.
"It is no doubt the handiwork of Boko Haram who operate in the area and frequently attack farmers."
The victims were labourers from Sokoto state in northwest Nigeria, roughly 1,000 kilometres (600 miles) away, who had travelled to the northeast to find work, said another militiaman Ibrahim Liman who gave the same toll.
"There were 60 farmers who were contracted to harvest paddy in the rice fields. Forty-three were slaughtered, with six injured," Liman said.
Eight others were missing, presumed to have been kidnapped by the jihadists, he said.
The bodies were taken to Zabarmari village, two kilometres away, where they would be kept ahead of burial on Sunday, said resident Mala Bunu who took part in the search and rescue operation.
Last month Boko Haram militants slaughtered 22 farmers working on their irrigation fields near Maiduguri in two separate incidents.
Boko Haram and ISWAP, its IS-linked rival, have increasingly targeted loggers, herders, and fishermen in their violent campaign, accusing them of spying and passing information to the military and the local militia fighting them.
At least 36,000 people have been killed in the jihadist conflict, which has displaced around two million since 2009.
The violence has also spread into neighbouring Niger, Chad, and Cameroon, prompting a regional military coalition to fight the militants.