Washington imposed a curfew and deployed the national guard against mass protests and riots.The mayor of the US capital Muriel Bowser has ordered to set a curfew in the district of Columbia from 23.00 Sunday to 6:00am Monday local time.In addition, it deployed the national guard to support the Metropolitan police Department, reported in the microblog of the mayor’s office on Twitter.Previously, the D.C. police said that after the riots in the night of Sunday in the city was arrested 17 people, injured 11 guards.Floyd began to complain that he could not breathe, and then lost consciousness and later died in hospital. The arresting police officers were fired and one of them was accused of murder by negligence.