Dallas police used a robot to deliver bomb that killed shooting suspect

A standoff between police and one of the suspects in a Dallas shooting that left at least five police officers dead and seven others wounded Thursday night ended after the suspect was killed when a robot delivered and detonated explosives where he was holed up, according to local law enforcement officials. "We saw no other option but to use our bomb robot and place a device on its extension for it to detonate where the subject was," Dallas Police Chief David Brown said at a news conference Friday morning. "Other options would have exposed our officers to grave danger." Attempts by a hostage negotiator to convince the suspect to surrender were unsuccessful and the man exchanged fire with the police during the standoff, Brown said. Three other suspects are currently in custody, according to police.