This is the city with one of the most restrictive gun control programs in the country.
A department spokesman would not confirm the tally, saying several incidents were still under investigation and could not be classified at this time.
According to the summaries, there have been at least 200 homicides so far this year compared with 134 during the same period in 2011. That's a 49.25 percent increase over last year.
On Tuesday, Mayor Rahm Emanuel and Police Superintendent Garry McCarthy are expected to hold a news conference where they discuss two new crime reduction strategies.
The 10 people killed over the long weekend outnumber the four reported slain during the 2011 holiday weekend, when severe storms hit the Chicago area and forced many people inside.
Shootings are up nearly 14 percent over last year, according to the unofficial summaries. There have been 851 shootings so far in 2012 compared with 747 during the same period in 2011, the police data showed.
The seemingly worsening violence comes as the Emanuel administration touts its efforts to combat gang crime and add officers and resources to some of the city's most dangerous neighborhoods.
A 50% increase in homicides? Whatever Rahmbo is doing, he better change it quickly. The city -- with the massive assistance of the state and federal government -- did a good job during the NATO summit. I was in Chicago for the Heartland Climate Conference and I can tell you I have never seen such a massive police presence anywhere. Cops on horseback, cops on bikes - thousands of them. It made me feel weirdly safe while at the same time offending my republican sensibilities.
It's not like Chicago cops are incompetent. They're not. But whatever deployment plan they have in place, they better change it or Chicago is going to become known as the Murder Capital of the US.