Off-duty deputies will provide security at Sonic Drive-In locations in the Crossroads after a string of armed robberies at the fast-food chain.

Three Sonic locations owned by Victoria-area investors have been the target of armed robberies. Two other Sonic locations also have been targeted.

In February, Sonic Drive-Ins in Victoria, Port Lavaca and Hallettsville began locking their doors at 10 p.m., leaving the drive-thru window open until closing time.

The six Sonic locations made the change in hours after an armed, masked man forced four employees into a walk-in cooler while he robbed the safe at the Sonic Drive-In on North John Stockbauer Drive. Two more restaurants were targeted after the change in hours, prompting the owners to hire off-duty deputies from the Victoria County Sheriff's Office to provide security until further notice.

Drop safes are being installed at the six area locations. A slot in the drop safe will allow employees to place money in the safe, but only a manager will be able to open the safe and not until the next day.