Police defend use of robot to kill sniper, saying officers could not approach him

The US military veteran who fatally shot five Dallas police officers last week was plotting a larger assault, authorities said, disclosing how he had taunted negotiators and written on a wall in his own blood before being killed.

Protests against US police tactics continued for a third straight day on Sunday, with scores arrested in Baton Rouge, Louisiana, after authorities warned that violence during street demonstrations over the fatal police shootings of two black men last week would not be tolerated.