Democratic presidential candidate Barack Obama has been labelled a terrorist at a rally for his Republican rival John McCain.
McCain was speaking at a rally in New Mexico when he asked the crown, "Who is Barack Obama?"
Immediately a supporter yelled out, "A terrorist," which seemed to delight the crowd but left McCain looking slightly startled.
Despite the disturbance the Republican nominee continued his speech, moving on to chasten the Democrats for launching an "angry barrage of insults".
Obama recently lashed out at McCain and his running mate for turning to "low-blow" personal attack in what he said was an effort to direct attention away from US economic crisis.
The angry backlash came after McCain's running mate, Sarah Palin accused Obama of consorting with terrorists in an attack on his ties in Chicago to former anti-Vietnam war militant William Ayers.
Palin's reference to a connection between Mr Ayers and Obama sparked a similarly angry reaction from her supporters.
"Now it turns out, one of his earliest supporters is a man named Bill Ayers," Palin said.
"And, according to the New York Times, he was a domestic terrorist and part of a group that, quote, 'launched a campaign of bombings that would target the Pentagon and our U.S. Capitol,'" she continued.
"Kill him!" proposed one man in the audience.
The Democrat hit back with a new television spot hammering Republican John McCain for wanting to turn the page on the US economic crisis and resorting to political attacks only weeks out from the presidential election.