A firefighter records video at the site of amulti-pileup on an expressway in Xuzhou, Jiangsu province, Mar 17, 2012. [Photo by Shao Guodong / China News Agency]

At least six people have been confirmed dead and 30 others injured in four separate multi-pileup accidents involving more than 60 vehicles on an expressway in Xuzhou, Jiangsu province, on Saturday morning, according to the local traffic police.

The source said all the accidents happened in the Xuzhou section of Beijing-Taiwan Expressway, which was shrouded in a dense fog.

More casualties are feared, as rescuers are still searching for victims in the crashed vehicles. Among the injured, six are in critical condition.

A family member of a man injured in a multi-pileup on an expressway looks attends to him in a hospital in Xuzhou, Jiangsu province, Mar 17, 2012. [Photo/Xinhua]