German investigators on Tuesday morning searched the residences of four suspected Chinese spies. According to information obtained by Spiegel Online, the suspects had been spying on Munich's Uighur community on orders from the Chinese government.

Unlike China's imposing embassy in Berlin, the general consulate in Munich is no symbol of power. The representative office in the Bavarian capital is located in the upmarket district of Neuhausen in an inconspicuous corner building close to Nymphenburg Palace.

If you believe the consulate's own PR, the institution deals with pleasant issues such as business and travel visas, the Olympic Games or German-Chinese trade relations. But if German investigators are to be believed, this idyll is merely a facade behind which the Chinese intelligence service is operating a network of spies.

On Tuesday morning, officers from Germany's Federal Criminal Police Office and the Bavarian police searched the homes of four Chinese nationals in the Munich area, Spiegel Online has learned. They are under suspicion of being intelligence service agents for the Chinese government tasked with spying on Munich's large expatriate community of Uighurs, a Muslim ethnic minority in China that has been engaging in violent protests this year against perceived discrimination.