Twelve world cities have agreed to darken their skylines for an hour in an Australian initiative to raise awareness about climate change, organisers say.

Seven men who plotted to destroy America’s tallest building Chicago’s Sears Tower, hoping to start a revolution which would pave the way for an Islamic regime, went on trial today.

A suspected terrorist cell planned a "chilling" attack to destroy New York's John F Kennedy International Airport, kill thousands of people and trigger an economic catastrophe by blowing up a jet fuel artery that runs through residential neighbourhoods, US authorities said tonight.

The September 11 attacks, the Bali bombing and plots against British targets were among the confessions of Khalid Sheikh Mohammed during a military hearing at Guantanamo Bay, Cuba, according to a transcript released by the Pentagon.

IRISH-born property developer Garrett Kelleher is behind a new development in Chicago set to be one of the world’s tallest buildings.

A group of young men seized in a Miami warehouse have been charged in a federal indictment with conspiring with al-Qaida to commit acts of violence in the United States, including blowing up Chicago’s Sears Tower.

Seven people have been arrested in connection with a plot to blow up Chicago’s Sears Tower and other targets, the FBI said.

THREE al-Qaida suspects arrested in Saudi Arabia this week planned to hijack a plane from the southwestern port city of Jiddah, Saudi security officials said, in what appeared to be a plot for a suicide attack.

Californian authorities increased patrols on and around the Golden Gate Bridge after learning of a potential terrorist threat 11 months after attacks on New York and Washington.

Police in California have doubled security near the Golden Gate Bridge after Spanish police seized videos of it from suspected al-Qaida terrorists.

Thousands of workers and shoppers were evacuated today from the world’s tallest buildings, the Petronas Twin Towers in Kuala Lumpur, following a bomb threat that came as many Malaysians were just learning of the terror tragedy gripping the United States.

In Chicago the Sears Tower, Dirckson Federal Building, Field Museum, MERC, CBOT, Merchandise Mart, O'Hare Airport, Thompson Federal and Bank One have all been closed.

Authorities went on alert from coast to coast Tuesday, halting all air traffic, evacuating high-profile buildings and tightening security at strategic facilities following the attacks on the World Trade Center and the Pentagon.

The London stock exchange has now been evacuated in response to terrorist attacks in the US.