After two years, the only museum on Chinese soil commemorating the Tiananmen Square massacre in 1989 will close Tuesday. 

The June Fourth Museum is run by the Hong Kong Alliance, a pro-democracy group, which said Saturday the closure was due to pressure from the building's owners' committee. 

The museum is housed in a 1,375 sq ft. space on the fifth floor of a commercial building in Hong Kong's Kowloon district.