A 20-year-old man’s Twitter posts sympathising with Islamic terrorists led to an undercover FBI operation and the man’s arrest on charges that he plotted to blow up the US Capitol and kill government officials.

A man accused of plotting to attack the US Congress building and kill staff inside has been arrested by the FBI in an undercover operation.

The Republicans' newly-chosen vice presidential candidate wasted no time in attacking Barack Obama's economic stewardship in his first solo campaign event.

PRESIDENT Barack Obama, under pressure from fiscal conservatives, will seek a three-year freeze on domestic spending in his 2011 budget that would save $250 billion (€177.5bn) by 2020, administration officials said.