Detectives with the Delaware State Police have arrested four people in connection with a series of self-storage unit burglaries in Kent and New Castle counties.

The seven burglaries began in July 2016, Delaware State Police spokesman Master Cpl. Jeffrey Hale said.

Troopers made the arrests based on clues from the most recent break-in, which took place Feb. 5 at North Dover Storage, located at 4660 N. Dupont Highway, Dover.

During that investigation, detectives received a tip based on surveillance video released to the public and were able to positively identify 20-year-old Jacob Kolar of Wilmington as well as a 16-year-old from Townsend as the suspects.

Additional work tied Dennis Smith, 21, of Middletown as well as a 14-year-old from Townsend, to the crimes.

A search of the juveniles’ home, located in the 200 block of Avonbridge Drive, turned up a large number of items that had been reported as stolen, Hale said.

All of those arrested have been charged with possession of a firearm during the commission of a felony, third-degree burglary, possession of burglar’s tools, theft of a firearm, second-degree conspiracy, felony theft, misdemeanor theft and criminal mischief.

The two teens additionally were charged with possession of a firearm by a person prohibited.

Kolar was committed to the Howard R. Young Correctional Institution, Wilmington, on a $32,000 cash bail; Smith also was incarcerated at the Young facility but on a $50,000 secured bail.

The 16-year-old was committed to the New Castle County Detention Center, Wilmington, on a $32,100 cash bail, while the 14-year-old was released from custody on a $9,300 unsecured bail.

In addition to the Feb. 5 break-in in Dover, the thefts took place at storage facilities in Townsend, Newark, New Castle and Bear.