Crime continued to decline in River Forest in July with all areas of offenses showing improvements over last year's numbers, according to a report presented to the board of trustees.

Felonies, such as criminal sexual assaults, battery and robbery (called Part I crimes), dipped 4 percent compared to last year. Non-violent crimes, such as traffic offenses and other misdemeanors (called Part II offenses), dipped 2 percent over last year's figures. Total calls for service dropped 5 percent over this time last year.

To date in 2013, violent crime has dropped 12 percent over last year's totals, and non-violent crime plunged 47 percent, according to the report.

Overall in July, officers made nearly 100 arrests for offenses of varying kinds. Among the highlights in the report were:

Two teens were charged with one count of burglary in River Forest and a third was charged with burglary in Forest Park after they were caught in possession of stolen bicycles and mini-bikes. An officer saw the three subjects leaving an alley in the 7700 block of Madison Street.

A 21-year-old from Oak Park was charged with felony possession of marijuana after a resident saw the young man and another male acting suspiciously in the 8000 block of Lake Street. During the stop, 34 grams of marijuana were confiscated. The other suspect, from River Forest, was released without charges.

During July, the detective unit opened 34 new cases for follow-up investigations, with a majority of them considered Part I crimes.

The detective division also played a role in putting a dent in the local marijuana supply trade when officers assisted the U.S. Postal Inspective Service and a similar department from Chicago in arresting Carey Mackinley of Oak Park for possession and delivery of a controlled substance. The investigation that took place revealed a large network of former high school students — now in college — who were importing large amounts of marijuana from out of state for distribution in the suburbs.

Detectives also found and reunited a missing 18-year-old daughter with her family.

In addition, there were 47 calls for service at Town Center, including three thefts and three retail thefts, according to the report.