Police cordon an area where suspected explosives were reported in Shenzhen, South China's Guangdong province, March 16, 2012. Three notes saying "Explosives with the car, do not call the police" were found on the windows of three cars in different locations around the city from 2:00 pm to 4:30 pm on Friday. The cars were declared safe after the explosives turned out to be fake after being tested by police. [Photo/CFP]

A specially trained explosives expert tests the suspicious device after explosives were reported in Shenzhen, March 16, 2012. [Photo/CFP]