Eight foreigners - from Iran, Mali, Pakistan and the Philippines - have been detained in Shanghai in four criminal cases since mid-September, Jiefang Daily reports.

The Shanghai No 2 Intermediate Procuratorate has warned locals not to blindly believe everything their "international friends" tell them. In the latest case, a man identified as Moulaye from Mali cheated Zhang, a local businessman, out of 160,000 yuan (US$19,330).

Using two sheets of black paper and a small bottle of liquid, the man showed Zhang how he could turn the paper into US$100 notes. He sold the special method to Zhang for the stated amount, but never delivered the goods.

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