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The war between Baidu Inc, owner of China's most popular Internet search engine, and Qihoo360 Technology Co, a newcomer in the field, is heating up.

The share price of Baidu stumbled on Wednesday after Qihoo announced it was using a self-developed search engine.

Qihoo's announcement came after earlier reports speculated that the company, famous for its anti-virus software products, was grabbing results from other Web search engines to create its own.

"The company holds the patent of 360 Search, a self-developed engine that took us seven years to develop," the company said, adding that Qihoo is equipped with "Web search engines."

Many analysts believe Qihoo is not yet ready to challenge Baidu, which became the nation's top search giant after Google left the Chinese mainland in 2010.

Baidu's share price declined more than 6 percent on the Nasdaq on Wednesday to close at $113.10. The company's stock has dropped nearly 8 percent since Aug 23, according to US financial website CNN Money.

Qihoo edged up 2.04 percent on the New York Stock Exchange on the same day.

Baidu, which generates nearly 80 percent of online advertising revenue in the nation's Web searching sector, on Tuesday afternoon started to redirect search traffic coming from Qihoo to its own home page.

Qihoo quickly responded by leading all Baidu-related search requests to cached pages, which mostly have outdated content and awkward typesetting.

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