BRUSSELS, Dec. 29 (UPI) -- The European Union Monday called on pro-reform parties in Serbia to join together to keep extreme nationalists out of power.

The BBC reported foreign policy chief Javier Solana said Brussels would back a government based on a strong European reform agenda.

The ultra-nationalist Serbian Radical Party (SRS) won more seats than any other in Sunday's election. It has little hope of entering government now, but its chance could come if reformers fail to create an effective coalition, the BBC said

"I appeal to all democratic forces to work together in order to ensure that a new government based on a clear and strong European agenda can be formed rapidly," Solana said.

With about 95 percent of votes counted, the SRS party and the Socialist Party of Serbia, both headed by men facing war crimes charges at the U.N. tribunal in The Hague (OTCBB:HGUE), were on track to get 103 seats out of total 250.

Four pro-reform parties were expected to get the other 147 seats.