Denver, Colorado  - A federal attorney will discuss later Tuesday details of the arrest of three men in connection with what authorities believe could have been a threat against presidential candidate Barack Obama, officials said.

In a statement earlier Tuesday, US Attorney Troy Eid said federal police were working "hand in glove" with local police in Aurora, a town on the outskirts of Denver where the initial arrest of a man with firearms and drugs took place.

But Eid sought to allay fears that there was a serious threat.

Denver, Colorado/Washington - The arrest of a man with firearms and drugs in Colorado led to two other suspects in a case that authorities believe could have been part of a threat against presidential candidate Barack Obama, according to media reports Tuesday.

Federal law enforcement officials were expected to release more details in the case later Tuesday, the Denver Post reported on its website.

Denver, Colorado - The scramble for the White House was dead even between Democrat Barack Obama and Republican John McCain, according to two separate polls released late Sunday, the eve of the opening of the Democratic nominating convention.

The Gallup Poll showed each candidate with 45 per cent support from registered voters, while a CNN/Opinion Research Corp poll showed a 47-per-cent stalemate.