HOUSTON (AP) - Authorities say three suspects have been arrested in the investigation of at least seven drug store armed robberies this month in the Houston area.

The Harris County Texas Sheriff's office on Wednesday announced the arrests in a joint operation with the Texas Department of Public Safety.

Officials say the suspects face aggravated robbery charges after being nabbed Tuesday night following a reported holdup of a Walgreens. A law enforcement statement says the suspects had guns, masks, gloves and more than $3,000 in stolen cash.

Investigators say six other robberies, allegedly linked to the suspects, also involved Walgreens stores in crimes that began May 2.

State and federal prosecutors are reviewing the cases. Further details weren't immediately available.

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