Authorities had on Tuesday said five soldiers were killed and five others injured in the raid on a military post near the village of Sabon Garin Kimba about 140 kilometres (90 miles) from Maiduguri, the birthplace of Boko Haram.
"The number of fatalities on our side has risen to nine with the discovery of four more bodies of our troops," said a military officer with knowledge of the incident yesterday..
Scores of fighters loyal to the Boko Haram faction headed by Abu Musab Al-Barnawi stormed the checkpoint late Monday.
The Islamic State group last year appointed Al-Barnawi as head of Boko Haram, replacing long-time leader Abubakar Shekau.
Mustapha Karimbe, a member of an anti-Boko Haram militia, said he feared the missing soldiers had been seized.
"Fourteen soldiers are unaccounted for, they have been missing since the attack and the fear is that they have have been abducted by the terrorists," Karimbe said.
This was the second attack on the same military checkpoint in under a month.
Late last month, jihadists dressed in Nigerian military uniforms attacked the checkpoint and forced soldiers to withdraw before looting food and medical supplies from the village.
Boko Haram has in recent weeks intensified attacks on military targets in the northeast.
The insurgency began in northeast Nigeria and has spread to Chad, Cameroon and Niger, claiming more than 20,000 lives and displacing 2.6 million people.
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