The men dressed in black stormed the premises when the tribunal was hearing a complaint lodged by aspirants from Nyakach constituency where Aduma Owuor won the primaries.
The men are said to have roughed up and assaulted some of the aspirants who were meeting to challenge nomination results.
Some aspirants were reportedly attacked in the corridors as they struggled to get a chance to present their complaints.
Though the Star could not ascertain where the men came from, sources allege the goons were hired by some aspirants to prevent their opponents from challenging their victories.
Tribunal chair Willis Otieno led members in vacating the premises and suspended sittings until further notice.
ODM concludes its primaries on Monday but the process has been marked by chaos and confusion.
During the 2013 primaries, men dressed in black stormed the Kasarani stadium where the party was holding nominations, smashing ballot boxes and scattering voting papers. The process was then called off.