"The attacks occurred in two different places in Biu town market". More than 50 people were wounded.
"Countless of people have died while unaccountable were injured".
He said 15 persons died in the blast alongside the two suicide bombers.
Borno Police command spokesman, DSP Victor Isuku, confirmed the killings in Maiduguri on Sunday.
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Two female suicide bombers entered a marketplace in Biu, the third largest city in Borno State at 11.40 a.m. local time (1240GMT), police added.
"One of the bombers detonated an IED [improvised explosive device] strapped to her body within Biu's main market, while the other one detonated outside the market square".
Fifteen persons were on Saturday killed and 53 others injured in twin suicide bomb attacks on Biu market. Police patrols/EOD teams led by the Acting Area Commander Biu were promptly mobilized and dispatched to scene.
The source said the injured include a soldier and a wife of a soldier from Biu Barracks, who were at the market for shopping.