Bicyclists flood the streets of downtown Council Bluffs.

An estimated 15-thousand riders kicked off the first day of RAGBRAI on Sunday.

Hundreds of bicyclists are now pedaling their way across Iowa.

The annual trek started Sunday in Council Bluffs. Today, riders will go from Harlan to Perry, and tomorrow from Perry to Des Moines.

Disgraced former Tour de France champion Lance Armstrong, who was stripped of all seven of his titles after admitting to doping, is taking part in the first several days of the event. He has ridden in RAGBRAI in previous years.