An opinion poll compiled from four separate polls shows increased support for Geert Wilders anti-Islam PVV, which would take 23 seats if there were a general election tomorrow.

That is an increase of three over the past month, the poll of polls shows, and returns the party to the same level as in April this year, before its disappointing European election results.

One poll, by Maurice de Hond, puts the increase in support for the PVV down to fears of a terrorist attack in the Netherlands.

The ruling VVD remains the biggest party and would win between 29 and 33 seats in the 150 seat parliament if there were a general election tomorrow, the four polls show.

The PVV is second with 21 to 25, with the D66 Liberal democrats and Christian Democrats in joint third place on 18 to 22.