The department’s homicide clearance rate is 36 percent. Davis said the agents will use federal resources to help homicide detectives solve killings.

A total of 191 people have been killed in Baltimore in 2015. Forty-five people were killed in July alone, matching the all-time monthly high from 1972, when the city had 275,000 more residents. Forty-two people were killed in May, the month after the death of Freddie Gray in police custody sparked riots.

The violence this year is in some ways unprecedented: No previous year has had two months with more than 40 killings, and the 116 killed from May to July is a three-month high in data kept since 1970.

Davis said officers have confiscated about 20 percent more guns on the street this year than at this point last year. Police believe people are arming themselves amid an “atmosphere of uncertainty” after April’s unrest.