PET, the secret service, has now stepped in to help investigate the increasing number of death threats against Yahya Hassan, a controversial, 18-year-old poet whose first collection, released last week, criticises the Muslim community.

PET and police in Copenhagen say they are still collecting evidence and have yet to decide whether to bring charges in connection with any of the threats.

The media attention surrounding Hassasn's eponymous collection has helped push sales to over 10,000 copies, report booksellers. A normal poetry collection is printed in about 400 copies.

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