Dallas police chief David Brown has described the final words of a man who gunned down five police officers early Friday morning. The suspect said he was upset about Black Lives Matter, the recent police shootings, upset at white people and wanted to kill white people, especially white officers, said Brown.

The Independent, quoting the police chief said that reports that the suspect killed himself was not accurate.

He was deceased from the detonation of the bomb, he said. The bomb, launched on a robot, was triggered after a standoff between the suspect and police which lasted for hours.

"He was lucid. He expressed anger. He wanted to kill white police officers. He was angry for Black Lives Matter," said Mr Brown.

Brown said the suspect said he was not identified with any group, but the police chief said this does not mean there were not others involved.

The mayor of Dallas has said the identity of the suspect will not be released whilst a criminal investigation is ongoing.