The suicide bomb attacks occurred in Mandarari town of Konduga Local Government Area, about 37 kilometres from Maiduguri, the Borno State capital.
The attack occurred at 5:50 pm on Tuesday.
Guterres, in a statement issued by Stéphane Dujarric, Spokesman to the Secretary-General, called for the prosecution of those responsible for the senseless attacks.
The UN chief extended his deep condolences to the Government and people of Nigeria for the loss of life and wished a speedy recovery to those injured.
He called for “those responsible for these repeated heinous acts in Nigeria and neighbouring countries to be swiftly brought to justice”.
The Secretary-General reiterated “the United Nations solidarity and support to the Government of Nigeria in its fight against terrorism and violent extremism”.
The UN scribe also renewed the commitment of the United Nations to support efforts within the framework of the counter-terrorism initiatives of the Lake Chad Basin Commission.
Although details on the attack are sketchy, but a member of the Civilian JTF said a motor park was hit.
According to security official, the attack was carried out by three suicide bombers – two female and a male – who took turns to detonate the Improvised Explosive Devices strapped to their bodies.
The attack comes on the same day the Military launched Mobile Strike Teams into the Theatre of operation to enhance operational efficiency.