Authorities in Amsterdam have issued a warning against taking cocaine to tourists after the recent deaths of two British men.

The two British men, aged 20 and 21, died upon taking what they believed to be cocaine, but turned out to be "white heroin," police said.

To help combat the problem, large signs reading 'Extremely Dangers Cocaine Is Sold To Tourists' has been placed outside Central Station, and similar signs have been placed near popular tourist destinations throughout the city.

Anyone heading to the city to celebrate the closure of Trouw or one of the upcoming festivals is advised to be extra vigilant if and when buying drugs. 

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