PRAGUE, May 19 (Xinhua) -- Czech police seized drugs amount for over 20,000 doses worth 7.5 million crowns (0.5 million U.S. dollars), Prague police spokesman Tomas Hulan reported on the website on Monday.

    The police seized a total of 550 hemp plants and 15 kilos of dried drug and detained foreigners suspected of operating a large hemp cultivation plant, according to the website.

    "Both the plants and the dried marijuana were of the best quality, according to experts, and the final products were exclusively for the international market within the EU," Hulan said.

    The detained Vietnamese, aged between 21 and 40 years, were growing hemp plants at a 500-square-meter area, it added.

    The police accused all the detained foreigners of illegal production and possession of drugs. If found guilty, they face up to five years in prison.

    The cultivation unit equipment has been put at 2.5 million crowns (0.2 million U.S. dollars).