Beijing police Tuesday cracked down a underground factory which manufactured the fake blue pill, "Viagra", involving 2.5 million yuan (about 320,000 US dollars), according to sources with the municipal drug and food supervision bureau.

Police found 1,949 pieces of the fake blue pills in the underground factory, located in a two-story building in Tongzhou district in eastern Beijing, together with machines, packing materials, trade marks and even anti-counterfeiting tags, "Beijing Daily" reports Wednesday.

The Tongzhou branch of the Beijing drug and food supervision bureau last December got letters complaining that noises and fake medicines were produced in a certain building.

The branch teamworked with the police, health, industrial and commercial departments to investigate the case.

The Pfizer Pharmaceutical Company affirmed that all the products seized by the police were fake ones.

The Pfizer issued an announcement stressing that it possesses both registered Chinese and English trade marks of "Wan'aike", or "Viagra" in English and is the only authorized user of "Pfizer" trade mark.

Source: Xinhua