Chinese search engine Baidu Inc shares jumped 16.8 percent to $451.50 in premarket trade on Wednesday as rival Google Inc threatened to quit operations in China, warnings it would no longer tolerate strict censorshop of its search engine.

Google shares were down 1.9 percent to $579.20 in premarket.

(Reporting by Chuck Mikolajczak, Editing by Chizu Nomiyama)