Sheriff: Sibling fugitives spotted in region are extremely dangerous (with video)

In this undated FBI photo, Ryan Edward Dougherty, left, Lee Grace Dougherty and Dylan Dougherty Stanley are shown. Investigators say they received a tip that three Florida siblings accused of firing shots at a Florida police car and then robbing a bank in south Georgia may have traveled to Tennessee. Authorities have been pursuing the siblings since Tuesday, Aug. 2, 2011. (AP Photo/FBI via the Atlanta Journal & Constitution)

NEW PORT RICHEY, Fla. — Pasco County Sheriff Chris Nocco says he hopes three fugitive siblings will make a mistake as they continue to elude authorities after allegedly shooting at a police officer in Florida and robbing a bank in Georgia.

Appearing on CBS's "The Early Show" Tuesday, Nocco called the Zephyrhills siblings "extremely dangerous." He says they wouldn't be afraid to "get into a battle with law enforcement."

A nationwide manhunt began Aug. 2 when the trio took off after firing shots at a Zephyrhills police officer who tried to pull them over for speeding. Hours later, three people wearing masks robbed the Certus Bank in Valdosta, Ga., about 210 miles north.

Authorities say a white sedan similar to the one involved in the Florida shooting has been spotted in Georgia and Chattanooga, Tenn.