Three men were arrested in Colorado Sunday and Monday in connection with a possible assassination plot against presidential cand idate Barack Obama. One suspect, 28-year-old Tharin Gartrell, was stopped for a routine traffic stop Sunday when authorities found two rifles – including a sniper rifle – and methamphetamines in the car. Gartrell was also found to be wanted on numerous warrants. He was detained in Aurora, CO – a city approximately 25 minutes from the Denver site of the Democratic National Convention, where Senator Obama will accept the nomination for president later this week. Local Denver news station KCNC reported that Gartrell led police to a hotel where another man, 32-year-old Nathan Johnson, was arrested. A third – Shawn Adolf, 33 – tried to jump from a six-story building to avoid capture. Adolf broke his ankle in the jump and was eventually taken into custody. Definitive assassination plans were not uncovered, although the men reportedly made verbal threats against the cand idate in the presence of authorities, reports Fox News. The arrests are being treated as a drug case, according to Paul Bresson, an FBI national spokesman assigned to the Convention. “This is a methamphetamine and firearms case that arose from a traffic stop made by an Aurora Police officer,” said Bresson. “Firearms and methamphetamine were seized and a number of individuals are in state custody. The matter continues to be under investigation. We’ll provide more information as it becomes available.” The men are believed to have ties to a biker groups with connections to white supremacy groups. “It’s premature to say that it was a valid threat or that these folks have the ability to carry it out,” said a US government official familiar with the investigation. A news conference is set for this afternoon.