The U.S. Postal Service is offering a $50,000 reward for information leading to the arrest of two people who robbed a mail carrier at gunpoint Wednesday in Tampa.

Police say the man told the mail carrier to drive to another location. When they arrived, the suspect asked him where the checks were. Authorities believe the robbers were looking for federal income tax returns.

The mail carrier was sorting mail in his truck when police say he felt a gun at his side.

The Tampa Tribune reports the mail carrier told the suspect the checks might be in a tray. The suspect dumped the contents into a backpack and fled. He was joined at that point by a second man.

The mail carrier's name is not being released.

The Associated Press contributed to this report.