At sea and on land, heightened Expo security

Frontier and marine officers perform a security check on an oil tanker in Haimen port in Taizhou, East China's Zhejiang province, April 8, 2010. [Photo/Asianewsphoto]

Frontier soldiers in Zhejiang line up on a ship heading for a desert island to perform security drills, April 8, 2010. The soldiers have done a series of security drills on several desert islands near Zhoushan in Zhejiang since April 6 to prepare for the safeguarding of the area during the upcoming Shanghai World Expo. [Photo/Xinhua]