Three children fatally shot in four days: That is the latest grim toll in Chicago, which has been reeling from a wave of gun violence.

The latest spasms of gunfire came as Mayor Rahm Emanuel met with the United States attorney general, Jeff Sessions, in Washington on Monday to seek more federal aid to help curb the violence. The Department of Justice said in a statement that they had discussed what could be done to “bring back proactive community policing.”

And this month, the Bureau of Alcohol, Tobacco, Firearms and Explosives said it planned to send more agents to the city, where violence claimed more than 750 lives in over 3,500 shootings last year.