PANIC filled the streets of Glasgow yesterday as hundreds of people fled office buildings and traffic jammed the streets around the city centre.

The dramatic scenes took place on Cochrane Street as the second day of filming on £80 million Hollywood production World War Z, starring Brad Pitt, got under way.

Sirens wailed and screams were heard as police officers in American uniforms ran along the road to warn the public of an impending zombie attack.

Glasgow is doubling for Philadelphia in the pivotal scenes of the post-apocalyptic zombie flick.

And in the coming days, a spectacular car chase and two crashes are planned as well as a helicopter sequence that will capture the chaos unfolding on the streets.

Thousands of fans have converged on George Square in recent days desperate to get a glimpse of Pitt. Office workers have designated their lunch hour Brad-spotting time while others have travelled from further afield in the hope of meeting their hero.

Among the masses were Lanka Somosova, 24 and her sister Zuzanna, 17, who, visiting from Prague, came straight to George Square from the airport after reading about the movie on their morning flight from Dublin.

“We changed our plans as soon as we heard,” said Lanka. “It’s amazing. We hope we get lucky and see him.”

News of the filming has also been making headlines across the globe including in the Vancouver Sun, Houston Chronicle and Los Angeles Times.

Philadelphia itself, one imagines, is still a little sore at not landing the production. The Philadelphia Enquirer recently wrote: “Imagine moviegoers seeing what looks like City Hall, except it’s really Glasgow City Chambers at George Square, which – ouch! – was named for King George III, the very despot Philadelphia led the Revolution against.”