US aviation authorities restrict flights over Dallas after deadly shooting, reports AFP. The Dallas police chief David O Brown says three people are in custody in the protest march shooting, while the 4th suspect is exchanging fire with police. Dallas suspects claim to have 'planted bombs all over'. 

"The suspect that we are negotiating with that has exchanged gunfire with us over the last 45 minutes has told our negotiators that the end is coming, and he is going to hurt and kill more of us, meaning law enforcement. And that there are bombs all over the place in this garage and in downtown," Police Chief David Brown told reporters.

"So we are being very careful in our tactics so we don't injure our citizens in Dallas as we negotiate further."

Four police officers have been killed by two unidentified snipers who targeted them during a protest at Dallas in Texas, US over two recent fatal cop shootings of black men.

The 2 gunmen shot at 11 police officers, four of whom succumbed to their injuries, the Associated Press quoted the Dallas police chief as saying.  He added that negotiations were in progress with the second sniper suspect who is sporadically opening firing at police inside a garage.

The snipers shot from "elevated positions" during the protest. In addition to the four dead, two are in surgery and two are in critical condition, according to the statement.


Image: A photograph of one the suspected shooters issued by the police.