About 1,000 police officers, rescuers and hospital staff took part in a drill Wednesday designed to test Denmark's preparedness to a terror attack in the capital. The scenario of the drill - a bus explosion - was based on the London subway and bus bombings in 2005 and the 2004 train bombings in Madrid, Copenhagen police operations chief Per Larsen said. "It has been useful to hold this drill," Larsen said. "We have done a lot to prepare our officers mentally for these kinds of events." The results of the exercise - Denmark's largest of its kind - would be evaluated in coming weeks, he said.