At sea and on land, heightened Expo security

Police ships patrol in Haimen port in Taizhou city, East China's Zhejiang province, April 8, 2010. The city's security departments have intensified their fight against criminal activities at sea and enforced checking ships approaching Shanghai to ensure a safe social and transportation environment at sea during the upcoming Shanghai World Expo. [Photo/Asianewsphoto]

A frontier officer checks relevant documents of a man whose ship is heading for Shanghai in Haimen port in Taizhou, East China's Zhejiang province, April 8, 2010. [Photo/Asianewsphoto]