The Chicago Police Department plans to add 1,000 additional patrol officers each night of Labor Day weekend as part of an effort to combat violence.
At a news conference on Friday afternoon, Superintendent Eddie Johnson said manpower will be increased in areas where there have already been problems.
As of Friday night, more than 170 people had already been taken into police custody.
On Labor Day weekend 2018, at least three people were killed, and more than 14 were injured in shootings across the city.
The Chicago Police Department's Marine Unit will also be fully staffed following recent drownings. Supt. Johnson said officers will look out for pop-up parties.
"You might have five people outside, socializing, and they invite others, and that can turn into 200 in 30 minutes," he said.
Narcotics and gangs also remain a top priority for Chicago police, Johnson said. As part of what the department called 'Labor Day Roundup,' a total of 171 people were arrested for delivery of a controlled substance.
Johnson said additional patrols will be added if necessary.
