At least four people have died in violent protests in the Mongolian capital over alleged electoral fraud, officials and state media say. At least 130 police and protesters were wounded, and hundreds are said to have been detained in Ulan Bator. The president has declared a state of emergency and on Wednesday parts of the city remained sealed off.
Opposition supporters question early results from Sunday's poll, which give a clear victory to the ruling party.
Preliminary returns suggest the ruling Mongolian People's Revolutionary Party (MPRP) has taken at least 45 seats in the 76-seat parliament, but the opposition Democrats allege fraud.
Several thousand people gathered on to the streets of the capital after the preliminary results emerged on Tuesday.
The ruling party headquarters were set alight and government offices were looted. Paintings were destroyed by a fire at the national art gallery, Mongolia's Montsame news agency said.
Police used tear gas, rubber bullets and water cannon to force stone-throwing protesters back.
At a news conference on Wednesday, the country's Justice Minister Munkhorgil said five people had died, though state television and a foreign ministry official put the toll at four.
Late on Tuesday, President Nambaryn Enkhbayar announced a four-day state of emergency, to run from 2330.
"Police will use necessary force to crack down on criminals who are looting private and government property," said Mr Munkhorgil.
By Wednesday morning some areas were sealed off and roadblocks were in place, a AP writer in Ulan Bator said, but shops were open and transport was running.
Lawmakers and officials will meet in the capital later in the day for emergency talks on the situation, Montsame said.
Both the MPRP and international observers say the polls were free and fair.
But Democratic Party leader Tsakhia Elbegdorj said his party was robbed of victory.
"If most people voted for us why did we lose? We lost because... corrupt people changed the results," he said.
This is the fifth election since Mongolia adopted wide-ranging economic and politic reform in 1990.
Before that, its government was modelled on that of the neighbouring Soviet Union.
The MPRP ruled Mongolia from 1921-1996, when it was beaten by the Democrats. In 2004 the two parties were forced into an uneasy coalition but broke apart two years later.
The two parties disagree on how newly-found mineral reserves - copper, gold and coal - should be best exploited.