Smoke from headquarters of ruling party after protestors set it on fire in Ulan Bator, Mongolia, 1 Jul 2008 (Kyoto News Photo)

Mongolian President Nambaryn Enkhbayar has declared a four-day state ofemergency in the capital following violent protests over Sunday'sparliamentary elections.

According to the presidential decree,no public gathering will be allowed in Ulan Bator during the emergencyperiod beginning Wednesday after midnight.

Angry protesters onTuesday clashed with police and set fire to the offices of the rulingparty, accusing it of voter fraud. Police responded by firing rubberbullets and tear gas.

The full results of the election have yetto be released, but preliminary results show the ruling MongolianPeople's Revolutionary Party winning more than 40 of parliament's 76seats.

The head of the rival Mongolian Democratic Party, whichis predicted to have won more than 20 seats, says his party will notaccept the results of the race.

Both parties campaigned on apromise to give cash payouts to every Mongolian from big miningprojects, including a major copper deposit in the Gobi desert.

TheMongolian People's Revolutionary Party ruled the country for much ofthe past century as a one-party communist state, but introducedmulti-party democracy and market reforms in the 1990s.