The Netherlands last week raised its terrorism alert level to "substantial", partly due to the expected release of an anti-Islam film, reports the BBC.
It is the second-highest alert level, although the justice ministry said "there is no concrete evidence" that the country faced possible attacks.
The move comes as far-right Dutch MP Geert Wilders prepares to air his film, which has already angered Muslims. Mr Wilders has said the film is about the Koran, but gave few details.
Meanwhile, many in the Arab world have joined a boycott against Danish food products following a reigniting by Denmark of the cartoon controversy.
