WARSAW (Reuters) - Poles voted on Sunday in a snap parliamentary election that could weaken the grip of the conservative Kaczynski twins and bring in a government ready to speed up economic reforms and improve relations with EU allies.

Opinion polls suggest the Civic Platform, a centre-right opposition party, will attract most support.

However, no party looks set to win outright which would lead to negotiations over a coalition in the European Union's biggest ex-communist country. This election was called two years early after the last coalition collapsed over a corruption inquiry.

The Platform has plans to rebuild relations with EU allies that have suffered under the nationalist brothers. It also aims to pull Polish troops out of the U.S.-led force in Iraq.