The FBI says four men robbed a Denver area bank Tuesday, and it appears to be related two earlier holdups this month.
No injuries were reported in the robbery of a US Bank branch on Tuesday morning in Aurora.
The FBI says preliminary reports indicate the four robbers were armed.
No arrests have been made in any of the cases. Details of the other two robberies were not immediately available.
The FBI is investigating four other bank robberies in which the robber did not show a weapon. The agency says those are not believed to be related to each other.
And in November, two people attempting to rob another Denver area bank were killed in a shootout with police.