DENVER (AP) -- Authorities are investigating whether there was a plot to assassinate Barack Obama, while at the same time saying there was "no credible threat."
Officials have arrested three men and a woman suspected of plotting to shoot Obama as he gives his acceptance speech at the Democratic convention in Denver.
Three senior FBI officials says it's unclear whether shooters could have had a clear path to hit the stage from outside the convention hall. The officials say at least two of the men may have white supremacist ties, adding it's unclear whether any of them was serious about carrying out threats.
One of the men arrested told KCNC-TV in a jailhouse interview that others involved in the case had made racist statements regarding Obama.
Asked if he felt there was a plot to kill Obama, Nathan Johnson said, "Looking back at it, I don't want to say yes, but I don't want to say no." Johnson says he wasn't involved in any plot.
(Copyright 2008 by The Associated Press. All Rights Reserved.)