Hong Kong police arrested four people on the 35th anniversary of the 1989 Tiananmen crackdown. Among them, an elderly woman was apprehended on suspicion of acting with seditious intention under the city’s new, homegrown security law. Two men and two women were arrested around Causeway Bay on Tuesday, which marked 35 years since Beijing sent the People’s Liberation Army to put an end to a months-long democracy movement led by students in China. It is estimated that hundreds, perhaps thousands, died in the military crackdown. No more vigilsHong Kong used to be one of the few places on Chinese so…