Foreign minister Bert Koenders has summoned the Turkish ambassador to explain claims that the government's imam and mosque organisastion Diyanet is collecting information about what it calls 'Gülen sympathisers'.
Koenders described the claims as worrying and unacceptable and wants the ambassador to clarify the situation, broadcaster NOS said.
Last week Turkish media reported Diyanet had told a Turkish parliamentary commission it was collecting information in 38 countries. The Netherlands was one of the countries listed.
On Wednesday, the Telegraaf said Diyanet's current chairman in the Netherlands, Yusuf Acar, used to work at the Turkish embassy in The Hague and has admitted passing on names as part of that role.