The chief of defence staff and a senior presidential aide announced on Friday that agreement had been reached to end hostilities and the possible release of more than 200 kidnapped schoolgirls.
Air Marshal Alex Badeh said he had instructed all armed forces' chiefs to ensure the "immediate compliance" with the development.
But a senior army officer in the violence-wracked northeast, who asked to remain anonymous, said: "Honestly, we are yet to receive any operational order on the ceasefire.
A senior intelligence official in the region also indicated to AFP that he had not received word about the purported ceasefire.
Locals said yesterday that dozens of suspected Boko Haram gunmen had stormed the town of Abadam in Borno state on Thursday.
A number of residents said at least 30 people were killed on Thursday and Friday while hundreds of others were forced to flee across the border into neighbouring Niger.
"We all heard of the ceasefire over the radio but it seems the insurgents are not perturbed at all," another resident, Mallam Babagana, said on Sunday.
Elsewhere, Enoch Mark, whose daughter and niece are among the 219 schoolgirls who have been held by Boko Haram since mid-April, said there had been another attack in neighbouring Adamawa state.
He said the attack, in the village of Wagga on Saturday, saw some 40 women abducted -- an established Boko Haram tactic in its bloody five-year insurgency.
On Friday, eight people were also killed on a road in the Borno state village of Shaffa near where a prominent Muslim leader, the Emir of Gwoza, was ambushed and killed by Boko Haram fighters in May.
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