Event:
A memorial event was held in Hong Kong in remembrance of lives lost in Tiananmen Square protests in Beijing in 1989; authorities on the mainland tightened security and may be detaining many in order to avoid commemorative protests at the square itself
More Notable Events on June 4:
1984 Bruce Springsteen releases "Born in the USA"
1984 DNA is successfully cloned from an extinct animal
1975 Oldest animal fossils in U.S. discovered in North Carolina
1896 Henry takes his 1st Ford through streets of Detroit
1892 Sierra Club forms in San Francisco
