Filming continued for Brad Pitt's World War Z yesterday on George Square as hundreds of extras took to the streets as the zombies were set loose for the first time.

George Square will be closed to motorists on Saturday with pedestrian access limited. A dramatic crash scene has already been shot with extras dressed as US soldiers and zombies wandering the streets.

Surprisingly entertaining, even fitfully exciting, "World War Z" is primarily an exercise in expectation management. Forget those trailers suggesting a rock 'em, sock 'em, blow-it-all-up ...

World War Z, which may be the most entertaining and accomplished zombie thriller since George A. Romero’s Dawn of the Dead (1979), has touches of that suspenseful high-tension claustrophobia.