ARRESTED now in Colorado...but what a story and week for 2 brothers and their stripper sister! Text messages and tweets by three fugitive siblings who shot at a police officer and robbed a bank reveal a dangerous mindset and a firm bond between the siblings, "We've certainly seen their mindset when... They shot at a law enforcement officer outside of Tampa Bay, Fla., and when they fired inside that bank in Valdosta, Ga. But these additional texts and tweets have given us additional insight," FBI Special Agent Stephen Emmett told "Good Morning America" today. " We are concerned and feel that they are going to continue and cause problems to say the least for law enforcement." Ryan Dougherty, 21; his sister Lee Grace E. Dougherty, 29; and half-brother Dylan Dougherty Stanley, 26, have been on the lam since Aug. 2 when they shot at a police officer attempting to pull their white Subaru Impreza over for speeding. A few hours later, they robbed a bank in G