BEIJING, Aug. 4 (Xinhua) -- China continued a five-day military exercise on Wednesday as the country's air defense forces carried out reconnaissance, early warning, electromagnetic interference and ground-to-air attack drills.

More than 12,000 Chinese military personnel, along with seven types of military aircraft divided into Red and Blue rivals, took part in the exercise code-named "Vanguard-2010,"-- which started on Tuesday in seven cities across Henan and Shandong Provinces.

On Wednesday morning, the Blue forces used reconnaissance planes and electronics warfare aircraft to conduct surveillance and jam the network systems used by the Red forces for command and communications as well as reconnaissance and early warning.

A ground-to-air attack drill began at Wednesday noon, as the Blue forces launched unmanned aerial vehicles, fighters and helicopters to attack their rivals.

The ground-to-air attack drill will last overnight till 6 a.m. Thursday, military sources said.