Top of the hour, youre live in the cnn newsroom. Its 6 00 p. M. Eastern. Im poppy harlow in the cnn newsroom. We begin with the sniper who killed five Police Officers and wounded seven others in dallas. The killer left his own message in blood on a wall. He described for us the killers bizarre behavior during a Police Standoff on thursday night. The full interview is just moments away. Also, we know at least 261 people were arrested last night alone in a string of nationwide protests. Demonstrators outraged after two black men were shot and killed by police this last week. In st. Paul, minnesota last night, the most violence. Protesters throwing bottles, bricks and fireworks at police, injuring 21 officers there. Also this, president obama cutting his overseas trip short and heading to dallas on tuesday where he will speak at an interfaith memorial service. Chief david brown learned about heartbreaking pain and loss long before the violence in the city this week. He lost his son and hi