A war of words took place on Friday between engineers supporting and those opposing the Muslim Brotherhood-led board of the Engineers Syndicate.
An emergency general assembly meeting was held in Cairo stadium after 176 members submitted a request to withdraw confidence from the board.
Engineers opposed to the current board chanted for Defense Minister Abdel Fattah al-Sisi, whereas Brotherhood supporters flashed Rabaa signs and chanted against the military and police.
An estimated 20,000 engineers voted on the measure, according to Wael al-Degwy, the head of the committee in charge of conducting the vote.
Some syndicate members complained of alleged voter irregularities saying that engineers were transferred to the syndicate's headquarters in buses belonging to the Arab Contractors Company.
Others complained that they did not find their names although they are registered voting members.
The emergency meeting took place after the current board refused to respond to the request of those seeking its removal.