Despite the drop in shootings, murders have remained relatively flat compared to a year ago.
Dubbed the Chicago Crime Gun Strike Force, the group consists of ATF agents and counterparts from the Chicago Police Department and Illinois State Police, who will work to investigate shootings and gun traffickers through ballistics technology, the Chicago Sun-Times reported. Collins, the spokesperson for Mayor Emanuel, said the progress Chicago Police have made this year "happened without any of the new resources from the federal government we requested".
The Trump administration has sent federal help to Chicago to help it fight street violence and drug trafficking.
The number of murders and shootings in the Midwestern city of 2.7 million has been down slightly so far this year from the same period last year, according to police figures.
Trump's latest tweet said there have been 1,714 shootings in Chicago this year.
A law enforcement official told CNN Friday that the eight Federal Bureau of Investigation employees have left the city.
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Twenty federal gun agents have been assigned to Chicago to join a newly formed task force aimed at cutting the flow of illegal guns into the city and cracking down on people repeatedly arrested on gun charges.
Meanwhile, Chicago police say crime in the city has decreased from 2016, when there were 4,331 shooting victims and 762 homicides. Per the AP, Attorney General Jeff Sessions appeared on Fox and Friends Friday morning to talk about the initiative, noting "the police have been demoralized in many ways" and stressing that Chicago needs "to not be a sanctuary city" and should start deporting "violent criminals that have been convicted".
We need to have more federal gun prosecutions in Chicago. There were more than 4,300 shooting victims in the city past year, according to police.
"We always have been here", David Coulson, a spokesman for the Chicago field division of the Bureau of Alcohol, Tobacco, Firearms and Explosives, said at the time.
The additional agents follow the announcement Monday that the ATF had deployed a high-tech van in Chicago that can immediately test guns and shell casings at crime scenes throughout the city.