In Potiskum, Yobe state in north east Nigeria, two bomb attacks killed 10 people on Monday, eyewitnesses and a hospital source said.
The first bomb exploded at around 1 p.m. (1200 GMT) in the office of a group set up to defend local people against such attacks, eyewitnesses said. A suicide bomber detonated a device at an outdoor tea drinking area a few minutes later.
“I heard a loud sound… It shook the whole of the area,” said Babagana Aminu, a shopkeeper based near the first bomb site, told Reuters by telephone.
In Ndjamena, the Chad capital, at least 27 people were killed in series of blasts at several locations linked to the country’s police, security sources told Reuters.
Among the dead were four suspected Boko Haram Islamist fighters. There were close to 100 people injured in the attacks.
The attacks, which included at least one suicide bomb, are the first of their kind in Chad.
“Boko Haram is making a mistake by targeting Chad,” Communications Minister Hassan Sylla Bakari said on state television. “These lawless terrorists will be chased out and neutralised wherever they are.”
Meanwhile, UN Secretary-General Ban Ki-Moon condemned the bombings in Chad.
In a statement issued by the UN Spokesman, Stephane DuJarric in New York, Ban extends his heartfelt condolences to the families of the victims and to the Government and people of Chad.
“He wishes a speedy recovery to those injured in the attack. The Secretary-General commends Chad for its courageous role in the fight against Boko Haram.’’
Ban stressed the importance of enhanced collaboration among countries in West and Central Africa in order to more effectively combat the threat of Boko Haram.
In this regard, he welcomes positive developments in the actual operations of the Multi-National Joint Task Force.
The Secretary-General reiterates that States must ensure that all measures taken to address the Boko Haram threat complied with all their obligations under international humanitarian, human rights and refugee law