Thousands of truck drivers went on strike over salary and haulage rates in the eastern Chinese port of Ningbo this week, and a logistics firm said on Friday the industrial action was disrupting operations at the world's sixth busiest port. In a statement on its official microblog account, Ningbo Port Co Ltd said the strike had started over trucking rates but declined to give further details. The company said it was taking measures to ensure that operations at the port, China's third busiest, were not disrupted and to ensure losses were kept to a minimum. Local media reported the strike began at the Beilun area of the port and that it started with a few hundred drivers and escalated on Thursday to a few thousand, who clashed with police.