What happened actually.

Before 5th of April.
The dirtiest campaign in the history of Moldova. The two televisions with national coverage (one belonging to the president's son, and the "public one", which is totally controlled by the communist government) have been disadvantaging the opposition in every news bulletin. Police intimidated opponents of the ruling party. The president, the prime minister, the president of the parliament had full access to the administrative resources. People were bribed with money, food and many times intimidated to attend meetings with representatives of the communist party. Even before the campaign, the national media was presenting news showing that the opposition wants to destroy the country and bring the crisis.

5th of April.
Way too many reports of dead people being present on the lists, who have signed for having voted!
Strangers on the lists, who do not belong to the addresses they were included too. Also signed as voted!
People voting at home. Some said they were voting for the 4th time that day.
People being included in many lists, voting more times.
Buses of gypsies with no documents at all, being given a special form with which they could vote, driven to vote, and then gotten drunk.
People being paid 50 lei (4,54 USD) to vote with premarked ballot, and bring the clean one outside, so that the next persons can do the same.
None of this could be perceived by the international observers, since they had no idea about people on the lists, their addresses, which of them were dead.
Their result was 14% higher above the latest polls and even 5% more than the exit poll.

6th of April.
(6 Apr 2009, 2:35pm, www.curaj.net) - http://www.curaj.net/?p=13720
"If you did not vote for communists - take a candle out in the street!
18.00, the monument of Stefan cel Mare
For youth, April 6th - day of national mourning Rep.Moldova"

People gathered. Way more people than expected.
In about 40 minutes, one of the organizers (Ghendaie Brega) suggested that they go to the presidency and continue the protest there. It continued.
At about 22:00 some were trying to force the entrance to the parliament. The leader of liberal democrat party, was the only one trying to stop them at that time. Asked them to go home. People were asking for more and said they would come the next day. They were told that if they should come the next day, they should do it calm, in front of the government, where the liberal democrat party had an authorization for a peaceful meeting.

7th of April.
9:30 The ones who organized the meeting on Monday said they did not plan that many people coming and the situation going out of control.
http://www.jurnaltv.md/index.php?article=1941

10:00 People gathered in front of the government. After some time a large group left for the presidency to protest there. Leaders of the opposition (Vlad Filat - president of the Liberal Democrat, Dorin Chirtoaca - vicepresident of the liberal party, mayor of the capital and Serafim Urechean - persident of Alianta Moldova Noastra, ex-mayor) tried to stop the angry protesters from provocations. They had no influence on the angry protesters.

Later the president of the communist staff (Mark Tkaciuk) blamed the opposition for the riots, while those were trying hard to stop the people from fighting.

Situation went out of control, the protesters entered the presidency and broke down and looted all they could. The flag of Romania and European Union was on top of the presidency. That was one big provocation, for which the communists still blamed opposition.

Having finished with the presidency, the angry crowd forced the entrance to the parliament, while the opposition leaders still tried to stop them. After some fight with the police. The protesters made a corridor so the police could exit, and then entered and through out of the windows the furniture, which was burned outside on the ground. Everything of value was stolen. Police did not try to intervene anymore, even though in the evening there were only about 300-400 people in the parliament and outside. Most - looters, the rest - spectators.

At about 22:00 2 floors of the parliament were burning, very few people left near it (practically only the looters), the firemen only started to fight the fire after 2 hours.
Meanwhile, in front of the government the protest was peaceful. Some tried to provoke the people to go take over the national television. Opposition leaders tried hard to stop them.
After midnight, about 30 drunk looters where arrested from inside the parliament, and the peaceful protest was also sent home by the police.
Now the communists try to drive the attention from the massive frauds to the riots, they say the opposition organized. The opposition has enough proof the elections were fraudulent and realize that riots would not be way to solve this situation.