More than 300 monks have been taking part in a peaceful anti-government protest in the Burmese city of Rangoon.
Military officials in Burma have used tear gas to disperse hundreds of monks holding a rally in the city of Sittwe, reports from the area say.
Amid heavy security, the monks chanted Buddhist prayers as they walked to the city's famous Shwedagon Pagoda.
Witnesses said some demonstrators were beaten and several were arrested.
This march is one of the largest since protests began on 19 August, in response to a sudden fuel price hike.
Monks have been taking part in various peaceful anti-government rallies across Burma in recent days, to protest against an earlier episode of violence.
Monastic leaders had warned that they would step up their demonstrations unless the government apologised for beating monks at an earlier rally.
Burma has also seen a number of street protests sparked by the sudden rise in fuel prices last month.
The group planning the latest protests - The Alliance of All Burmese Buddhist Monks - has urged its followers to boycott the military government.
The monks have been asked to refuse alms and offerings from anyone connected to the military.
Analysts say the boycott will be taken very seriously in Burma, because the nation's 400,000 monks are held in high esteem, and monks have been at the forefront of anti-government protests in the past.
Fuel increase
Tuesday's protest was part of nationwide action which monks had threatened to take, if the government did not apologise for its actions during an earlier rally in the city of Pakokku.
The monks marched to the famous Shwedagon Pagoda During the Pakokku protest, soldiers and state-backed militia reportedly beat up both monks and civilians even though their demonstration had been peaceful.
A day later, monks held a group of 20 military officials hostage for several hours to complain about their treatment.
Tuesday's rally in Rangoon is not the only action monks have taken in response to the events in Pakokku.
Several hundred turned out for a rally in the town of Kyaukpadaung on Monday, and there are reports of another protest being held in Sittwe on Tuesday.
The demonstrations are the latest in a series of anti-government protests, originally sparked by the military junta's decision to double the price of petrol and diesel on 15 August.
The price of compressed natural gas - used for buses - increased fivefold overnight.
The move was not announced ahead of time and the reasons behind it remain unclear, but it has hit people hard.
The demonstrations have continued despite the arrests of many of Burma's most prominent activists.
