A sniper who was involved the shooting of 11 police officers in Dallas Texas, is believed to have been killed during a stand-off with police.
US TV network CBS has reported the shooter shot himself during a stand-off with police while NBC reported he had been "neutralised.
“We are still in negotiations with a suspect at a garage … for the last 45 minutes and he has been exchanging gunfire with us and not being very co-operative with negotiations,” Chief Brown said.
"He has told our negotiators the end is going to come and he is giong to hurt and kill more of us - law enforcement.
“We still don’t have a complete comfort level that we have all the suspects.”
Chief Brown said the suspect in the garage had told negotiators there were bombs in the garage and around the Dallas downtown area and law enforcement officers would be working into the early hours of the morning to search the area.
The death toll stands at three Dallas Police officers dead and one Dallas Area Rapid Transit officer with seven other officers injured.
At an earlier press conference Chief Brown said at least two snipers opened fire on officers "from elevated positions".
"We believe that these suspects were positioning themselves in a way to triangulate on officers from two different perches and planned to injure and killed as many law enforcement officers as they could," he said.
Chief Brown said the three suspects in custody were not co-operating and detectives were continuing to interrogate them to discover the motive behind the attack.
He said police had attended some of the planning meetings for the protest and were yet to determine if the attackers were involved in the march.
“Our assumption is they were working together with rifles and were triangulated in different positions in the downtown area where the march ended up,” he said.
“It does seem they had some knowledge of the route, otherwise how would they know where to be?”
