A museum documenting the 1989 Tiananmen Square massacre has reopened in Hong Kong after a three-year hiatus, marking the 30th anniversary of the bloody crackdown on a pro-democracy protest.

"The reopening of this June 4th Museum on the 30th anniversary is a clear demonstration of our commitment to uphold memory, pursue justice and hope for the future of our country," Albert Ho, head of a group that operates the museum, said Friday, referring to the date the military crackdown is remembered by.

The museum showcases relics from the incident, including a helmet worn by Chinese student Wang Nan when he was shot in the head by troops, and a bullet fragment removed from another student, Zhang Jian, who recently died.