On the following night, a crowd of 500 to 600 Australian servicemen gathered outside the Red Cross building. The PX building was under heavy security and heavily armed American MPs were located on the first floor of the Red Cross. NCOs went through the crowd and confiscated several hand grenades. In Queen Street, a group of soldiers armed with MP batons ran into 20 U.S. MPs who formed a line and drew their handguns. An Australian officer intervened and persuaded the American commander to take his men away from the area. The crowd then moved to the corner of Queen and Edward Streets outside MacArthur's headquarters in the AMP Building and began shouting abuse towards the building. The intersection was filled with rings of Australians beating up GIs and more than 20 were injured.