Two center-right Polish parties have won the country's parliamentary elections and ousted its scandal-tainted government of ex-communists.

With 90 percent of votes from Sunday's election counted, the conservative Law and Justice Party has almost 27 percent and the free-market Civic Platform has more than 24 percent. The ruling Democratic Left Alliance won only 11 percent.

The two winning parties include supporters of the Solidarity trade union movement that toppled communism in 1989 and 1990. They plan to form a coalition to root out corruption and reduce an unemployment rate of nearly 18 percent, the highest in the European Union.

Law and Justice Party leader Jaroslaw Kaczynski says he has the mandate to become prime minister. But he says he will refuse the post if his twin brother, Lech, wins Poland's presidential election in two weeks.

Some information in this story provided by AP and AFP.