"Meet Ahmed Mohammed. He might be the most expensive hot dog vendor in New York, especially if he thinks you're a tourist," begins NBC 4 New York's investigation into a World Trade Center-area food stand the network caught on camera charging anywhere from $3 to $30 for a hot dog.

The investigation was launched after five fights reportedly broke out at the stand in the past week. Mohammed allegedly has been asking for the outrageous amounts of money after customers are already served, and sometimes, have even taken a bite. When asked why his prices fluctuate so drastically, he claimed to not speak English, the NBC 4 report said.

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The Department of Consumer Affairs requires vendors to post their prices, but Mohammed's were not, according to NBC 4, which noted that at another cart around the corner, "there's no question how much a hot dog costs -- it's listed at $1."

Anyone who encounters a stand with no price listed or is charged more than the posted price should file a complaint with 311. The DCA told NBC 4 it is investigating Mohammed.