Police were called to eject rival factions from the building on the Maison du Sport International, the home of several International Federations in the Swiss city. 

Swiss authorities are currently ruling over who is the rightful owner of the building.

A verdict is expected within 48 hours.

Until this happens, AIBA's offices will remain closed, meaning all activities have effectively ground to a halt. 

It marks the latest twist in a remarkable saga which has already seen AIBA Executive Committee members unsuccessfully demand the resignation of Wu during a two-day meeting in Moscow.

Wu instead called an Extraordinary General Meeting for three months time believing the National Federations will support him. 

His opponents, however, have taken matters into their own hands and have formed an "Interim Management Committee".

A notice was reportedly pinned to the door claimed that a motion of no confidence has been called against Wu.

"Dear AIBA employees," it said, according to Agence France-Presse. 

"Please be informed that the AIBA executive committee have passed a motion calling for a vote of no confidence in the current AIBA president, Wu Ching-Kuo.

"In addition, motions were passed enabling the establishment of an interim management committee (IMC) to manage the work of AIBA and AIBA headquarters and the organisation of the extraordinary congress.

"Consequently in this moment of transition it has been decided to close the office for the remainder of this week. The staff are being offered these three days as holidays."

insidethegames understands that around five AIBA Executive Committee members have been involved in the dispute today.

These include Wales' Terry Smith, Canada's Pat Fiacco and Italy's AIBA vice-president and European Boxing Confederation President Franco Falcinelli.

"AIBA condemns in the strongest possible terms the latest tactics of its Executive Committee, under the unrecognised 'Interim Management Committee', to attempt to illegally seize control of the organisation's headquarters in Lausanne on the morning of July 26," AIBA executive director William Louis-Marie said in a statement. 

"Their actions have not only prejudiced the operation of AIBA and the livelihoods of all of its employees, but threaten the forthcoming AIBA World Championships in Hamburg, undermine its capacity to fulfill its duty towards its 201 National Federations and finally contravene AIBA statutes and Swiss law. 

"A representative of this Committee has since been removed from the premises by Swiss police, but AIBA's headquarters must now remain closed pending the decision of the relevant authorities."

Wu, elected AIBA President in 2006 when he defeated Pakistan's Anwar Chowdhry, has been under fire over a multitude of problems relating to finances as well as competition issues during last year's Olympic Games in Rio de Janeiro. 

AIBA continues to claim that a settlement agreement has been reached with Azerbaijani company Benkons MMC to repay a $10 million (£8 million/€8.5 million) loan following reports they are on the verge of bankruptcy. 

Benkons director Hamid Hamidov had reportedly claimed in a letter sent to Louis-Marie that there was no schedule to repay the loan that was given in 2011 and due to be repaid by 2013.

AIBA blames former executive director Ho Kim for the missing loan and claims criminal cases are currently ongoing against him in Swiss courts.

They claim that Ho enjoyed "wide discretion in the negotiations and implementation of the transaction" and that Wu was not responsible.

Chinese businessman Wu Di has also filed for the return of money he invested in Boxing Marketing Arm (BMA), set up to promote and sell rights for all AIBA products.

Wu Di, owner of the firm First Commitment International Trade Company (FCIT), invested CHF19 million (£15.5 million/$20 million/€17 million) into BMA but filed paperwork on May 31 requesting that his money be returned.

In May, AIBA signed an exclusive global marketing agreement with Alisports, the sport division of Chinese e-commerce giants Alibaba, leading to BMA being closed. 

AIBA claim this decision was taken by the BMA Board, including Wu Di. 

The International Olympic Committee, of whom Wu is an Executive Board member, confirmed to insidethegames today that they briefly suspended AIBA funding late last year before releasing it after receiving promises that concerns were being addressed.

They are now "closely monitoring" developments to ascertain if "further action" is required.