The suspect involved in a stand-off with police died from a gunshot wound, shortly after a police explosive device was detonated nearby, mayor Mike Rawlings has just told CNN.
The explosive device was sent in by a robot, he said.
Mr Rawlings said it was still not clear if the suspect took his own life. He was being "very bellicose and saying he was going to take everyone out," the mayor said.
He said the three suspects in custody were "not being real co-operative". The police have "brought in a lot of people" to try to get to the bottom of the motive, he added.
He declined to comment on the races of the suspect involved in the stand-off or the police officers who were killed.
He said the female suspect - one of three in custody - was a "light skinned African American".