The first robbery happened near Louisiana Tech's campus on Oct. 28. Four people were robbed at gunpoint and the suspect took cash and electronics. Police said the incident did not appear to be connected to two later robberies at conveniece stores.

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The Z-Z Mart was robbed Halloween night and the E-Z Mart, on the other side of town, was hit early Monday.

"Well the patrol division will be increasing the frequency that they check these stores at night," said Capt. Bill Davis of the Ruston Police Department.

Investigators don't believe the first robbery was related to the two at the convenience stores, but they're not rulint out that the latter two are connected.

"And they very well may be, but we have not found anything to tie them together," Davis said.

At each store, a lone robber took an undetermine amount of money but no one was hurt.

Adrienne Bonner, a Ruston resident, said she was alarmed by the crime spree.

"It is scary, kind of scary. We do not get out much but when we do we want to be safe," she said.

With the holiday season approaching, Davis urged residents to be more cautious. "Always be aware of your surroundings and park in a well lit areas if you are parking in a large parking lot," he said.

Police are searching for suspects and leads in all three crimes.