The BNP has claim that Awami League activists stopped bus services in an attempt to reduce the size of the public gathering at its rally in Dhaka's Suhrawardy Udyan.
BNP Secretary General Mirza Fakhrul Islam Alamgir made the statement on Sunday.
He alleged that the government was trying to stop the party activists from going to the rally venue.
However, Awami League and Jatiya Party leaders said the bus owners did not bring out their vehicles fearing vandalism and arson attacks, which had happened during the previous programmes of BNP.
The BNP secretary general said the party was determined to make the rally a success at any cost.
Fakhrul said: "Since the morning, we have been hearing that our party men were stopped on various roads. The highways have been closed so that our activists fail to join the rally.”
Meanwhile, Senior Joint Secretary General Ruhul Kabir Rizvi said: “The government is acting in an undemocratic manner. Non-democratic behaviour will not be of any benefit.
The rally began around 2pm on Sunday, however, Party Chairperson Khaleda Zia is yet to join the rally.
BNP received written permission for the rally at Suhrawardy Udyan on the occasion of the Revolution and Solidarity Day. Earlier, Fakhrul said the permission was given to the BNP on 23 terms and conditions.
Besides, Awami League General Secretary Road Transport and Bridges Minister Obaidul Quader said BNP is organising the rally by disrupting the vehicular movement, which resulted in sufferings for city-dwellers.
He said: “Those who [BNP activist] occupied the roads for the rally without thinking about public suffering, they will destroy the country if they form the government.”