But the eventual collapse of the twin towers was so predictable that the order should have been given to withdraw emergency services within an hour, said Professor Knapton. He watched in horror, knowing the building would fall within two hours.  The hundreds of dead firemen and police officers should simply not have been there, he said.  "I think they should not have gone in at all," he said. "If they did decide to take the risk, they should have been pulled out after an hour."

Excerpt from an article by BBC News Online's Sheila Barter