Five police officers were among the 11 dead, said Chad's Minister of Public Security, Abderahim Bireme Hamid. He blamed extremists for the attack, saying that "the mastermind of the network was arrested yesterday."
The other six killed were extremists, he said.
"This is a result of the search this morning. When five members of Boko Haram saw police arrest a member, they set off the explosives," Bireme Hamid said on national radio. Three others were injured in the blasts, he said.