CHICAGO (CBS) -- Chicago Police were searching Monday for the person who broke into a restaurant in the Jefferson Park neighborhood.

Police said around 4 a.m., the burglars smashed the front glass door of Sweet Café, at 6348 W. Higgins Ave. near Nagle Avenue.

The burglars ran off with an unknown amount of money, police said.

Police have tied the burglary to one man who wore a black hat, black gloves, a mask, dark clothing, and a black backpack, who is suspected in 30 other burglaries.

Meanwhile early Monday, burglars targeted Lazic Deli, at 7035 W. Higgins Ave. near Nordica Avenue, about seven city blocks to the west of Sweet Café. Police found the front door of the deli had been damaged.

Another pattern struck the same area late last month. Between 1:40 a.m. around 1:55 a.m. Thursday, Jan. 23, the group broke into Roberto's Jewelers, 7005 W. Higgins Ave., Trio's Pizza, 7009 W. Higgins Ave., and Elite Total Rehab, across the street at 7008 W. Higgins Ave.

Several businesses in a strip mall on Harlem Avenue north of Touhy Avenue in Edison Park were also targeted Jan. 23, and police believe those burglaries are connected to the ones in Norwood Park.