CHICAGO (CBS) — Thieves have been hitting stores on the South Side and swiping flat-screen televisions, but police may now have a key clue.

Video surveillance footage may have caught one of the suspects in the act.

The burglars break the windows or glass doors to gain entrance and steal the TVs, Wentworth Area detectives said in a release.

Nine burglaries happened between the hours of 8 p.m. and 7 a.m. from May 6, 2011, through Jan. 20, police said. The first five happened between the 2500 and 4100 blocks of South Archer Avenue. The next two happened in the 3100 block of South Morgan, followed by one in the 2600 block of South Wallace and the most recent in the 3600 block of South Archer.

Police are urging business owners to activate alarm systems, keep perimeters well-lit and properly secure the store when leaving.

(The Sun-Times Media Wire contributed to this report)

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