Published: Sep 23, 2010 7:51 PM EDT
Updated: Sep 23, 2010 4:51 PM EDT

MIAMI (AP) - The FBI is offering a $40,000 reward for information leading to the arrest of the so-called "Sundown Bandits" who have robbed six South Florida banks in recent months.

The FBI says the robbers usually enter banks carrying weapons and wearing baseball caps. They also sometimes wear neckties and long-sleeved shirts. Both are described as black men between 25 and 30.

They are called the "Sundown Bandits" because they strike near bank closing time.

It's believed the same two have committed bank robberies in Miami-Dade, Broward and Palm Beach counties since December of last year. The most recent robbery was Sept. 9 at a Wachovia branch in Boca Raton.

Anyone with information can call the FBI in Miami at 305-944-9101.