Three men and a woman have been arrested over a possible plot to assassinate US presidential candidate Barack Obama.
In Denver, Colorado - where the Democratic National Convention is being held - police are holding Tharin Gartrell, 28, after a routine arrest in the early hours of Sunday morning in the city's Aurora suburb.
Gartrell was spotted driving erratically and when police searched his rented truck, they found two high-powered rifles, including one with a telescopic sight, a bulletproof vest, camouflage clothing, boxes of ammunition, walkie-talkie radios, licenses in the names of other people and methamphetamine.
A few hours later, authorities went to a hotel in Denver where an associate of Gartrell, Nathan Johnson, 32, was held. A third man, Shawn Robert Adolf, was located at a hotel in Aurora but jumped out of a sixth floor hotel window, breaking his ankle. He was found a few blocks away and subsequently arrested.
Adolf was reportedly wearing a ring with a swastika and is thought to have ties to white supremacist organisations. A woman, believed to be the girlfriend of one of the men, is also being held.
