FACTBOX: Accusations in Zimbabwe's election

(Reuters) - Zimbabwean opposition leader Morgan Tsvangirai withdrew on Sunday from the June 27 presidential election run-off, saying a fair poll was impossible.

Below are some of the main complaints that had been made ahead of the contest between Tsvangirai, who won a first round vote on March 29, and President Robert Mugabe.

VIOLENCE

Opposition leader Tsvangirai's Movement for Democratic Change (MDC) says at least 86 of its followers have been killed by supporters of Mugabe's ruling ZANU-PF party.

Thousands more people have been beaten up and their homes have been torched. Violence has been widespread, but particularly prevalent in former ruling party strongholds where the opposition did well in the March 29 general election.

The opposition said armed Mugabe supporters assaulted MDC members trying to hold a rally on Sunday, but the government said that was untrue and suggested it could have been a set-up.

Western countries and human rights groups also say Mugabe's supporters are behind the violence, but the government says the opposition is to blame.

ARRESTS

Tsvangirai was detained five times during his campaigning and his campaign vehicles were impounded. Tsvangirai's lieutenant, Tendai Biti, was arrested and faces treason charges over the early announcement of results from the first round of the election.

Police say they have arrested at least 390 opposition supporters and 156 members of the ruling party over election violence, blaming the opposition for most of the trouble.

MANIPULATING FIGURES

The opposition charged that figures from the first round of voting were manipulated by the electoral commission to deny Tsvangirai outright victory. Although he beat Mugabe, he fell short of the absolute majority he would have needed to avoid the run-off, according to the official figures.

AID

Foreign aid agencies were banned from working ahead of the election despite widespread food shortages in the country, which is suffering from economic collapse. The opposition and human rights groups accused the government of using access to food as a weapon to try to sway the election. The government said it was the aid agencies that were using food to persuade people to vote against Mugabe. They denied that.

MEDIA

The opposition accuses state controlled media of banning coverage of Tsvangirai's campaign and refusing to carry his broadcasts.

OBSERVERS

Observers from Western countries critical of Mugabe were barred from both the first round of voting and the presidential election run-off. The main observer mission was to be from the southern African regional bloc SADC. It had been due to send some 380 observers. African observers in Zimbabwe have been critical of the violence and had voiced doubts over whether it was possible to hold a fair election.

The government slashed the number of local observers permitted from 9,000 -- about enough to monitor every polling station -- to 500 form the presidential election run-off.

(For full Reuters Africa coverage and to have your say on the top issues, visit: africa.reuters.com/ )

(Writing by Matthew Tostevin)