mary calvi. thanks for joining us. >>> our top story, reducing violence at the city's homeless shelters. >> mayor de blasio will unveil a plan today to overhaul security at the shelters. janelle burrell has more now live in east harlem this morning. hi, janelle. >> reporter: hi there, chris and mary. we're outside the boulevard shelter here in east harlem. back in january, a man was actually murdered inside of this shelter as he slept. the mayor hopes that by investing more in the city's shelter system in terms of difference in terms of preventing violence. . immediately after the murder of devin black inside of the boulevard shelter back in january, there was a visible presence of nypd officers and security on patrol. the former teacher nearly decapitated by another man in the shelter. >> it lets us know that they're concerned with our well being. >> reporter: from murdered and assaults to the couldn't occasion of dangerous weapons, like these, recovered from five brooklyn shelters in just one day. mayor de blasio has now ordered the nypd to oversee safety measures in the shelters. among the changes, the nypd will be