Baltimore’s new Police Commissioner Darryl De Sousa said Monday that his stepped-up deployment of officers — dubbed Operation Blitz — had yielded immediate results, and he previewed other plans to reshape the department.

De Sousa briefed members of the City Council on his first days in office. Mayor Catherine E. Pugh named him to the post Friday, as she announced the firing of his predecessor, Kevin Davis.

De Sousa said an effort to deploy more officers onto the street for a 13-day operation had already resulted in 19 guns’ being seized, including a rifle and a shotgun, and 55 arrests.

But even as additional officers were out on the streets, the violence continued in Baltimore. Four people have been killed in shootings since De Sousa took over Friday morning, the Baltimore Sun reports.