Thavorn Senniam, a core protest leader, announced the triumph to the crowd after he negotiated with police officers at the city police headquarters.
The protesters then organised the crowd, telling them which route they should take to walk inside the MPB, beginning around 10.40am Tuesday but they still waited outside for about an hour before actually moving into the MPB grounds.
Earlier, the police cut the barbed wire and helped remove the concrete barriers to open the way for protesters.
The peaceful scene on Tuesday was totally different from Monday and overnight, when police fired tear gas as protesters attempted to storm and overturn the barriers.
On Tuesday, protesters were relaxed and had smiles on their faces.