Public Security Minister, Abderahim Hamid, said police raid on suspected members of the Boko Haram sparked a suicide bombing on Monday in N’Djamena that killed six suspects and five police officers.
Hamid said that three other police officers were injured in the bombing in N’Djamena.
He also said police on Sunday arrested a suspected regional leader for Boko Haram in a N’Djamena suburb.
Information given by one of his companions led to a raid on another house where the suicide bombing occurred.
Meanwhile, it was not clear how many terrorists blew themselves up.
A police source had initially said a suicide bomber had targeted a police patrol on the street.
The police operation followed triple suicide bombings on June 15 that killed 38 people in N’Djamena.
Chad, which attributed the attack to Boko Haram,has announced the arrest of about 60 people in connection with it.
Boko Haram is believed to be targeting Chad over its participation in military operations against its insurgency.