At least 15 police officers were injured by flying debris, and two of them were still hospitalised. Twenty-seven people were arrested, said Darryl De Sousa, the Baltimore Police Department's chief of patrol. Baltimore Police Department's chief of patrol.Mayor Stephanie Rawlings-Blake said the National Guard would be deployed "as soon as they are available" and imposed a city-wide curfew from 10:00 pm to 5:00 am beginning Tuesday, on top of a permanent nightly curfew for juveniles.