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Police clear streets during Taiwan's annual air raid drill

Wally Santana / AP

A policeman clears the sidewalks as an air raid siren begins to wail through the streets of Taipei.

Wally Santana / AP

Pedestrians use their smart phones in a subway station while police keep pedestrians off the streets during an air raid drill in Taipei, Taiwan, Wednesday, May 18, 2011. Taiwan held its decades-old annual air raid drill Tuesday, despite warming ties with China, the exercise's designated adversary. The Wan-an, or "safety for everyone" exercise, is an island-wide drill premised on widespread Chinese air attacks.

Wally Santana / AP

Police guide pedestrians off a street during an air raid drill in Taipei.

Wally Santana / AP

A policeman stops motorcyclists during an air raid drill in Taipei.

Here's more on the drill.