WASHINGTON (CNN) - Citing "significant risks to public health" Justice Department lawyers filed an injunction in Tulsa, Okla. Thursday, asking a federal judge to stop Rx Depot from importing prescription drugs that are purchased from Canada and sold at reduced prices.

In an eleven page filing, the Justice Department, acting on behalf of the Food and Drug Administration, alleges Rx Depot, Rx Canada, and the firm's top officials including company president Carl Moore violated several laws, and risked the public health of consumers.

Related Stories FDA eyes counterfeit drug crackdown U.S. warns firm over Canadian drugs Health costs skyrocket

"Drugs that are imported from foreign countries do not have the same assurance of safety and efficacy as drugs that are regulated by the FDA," the government lawsuit said. "Their quality is unpredictable. For instance they may be contaminated, counterfeit, or contain erratic amounts of the active ingredient," the request for injunction said.

The Justice Department had no immediate information on how quickly a U.S. District Court judge in Tulsa will hear their request.

The suit says Rx Depot based in Tulsa has stores in Oklahoma City and Tulsa, Okla.; Lowell, Ark.; La Mesa and Woodland Hills, Calif.; Boulder, Colo.; Mountain Grove, Mo.; Lincoln, Neb.; Carrollton and Paris, Texas; Port Charlotte and Fort Myers, Fla. and Billings, Mont.

Rx Canada, owned by the son of the president of Rx Depot, has stores in Oklahoma.

The FDA had warned Rx Depot in a letter in March that it was illegally importing drugs from Canada, and called on the firm to stop, or face possible shut down.

The injunction calls on the Court to grant restitution, but does not cite any amount the government is seeking to collect.

A Justice Department official told CNN "We're not asking for any money at this point. We're asking to shut them down."