Hong Kong residents attend a candle light vigil on June 4, 2019 in honour of the 30th anniversary of the Tiananmen Massacre. Victoria Park, Hong Kong.

Hong Kong residents attend a candle light vigil on June 4, 2019 in honour of the 30th anniversary of the Tiananmen Massacre. Victoria Park, Hong Kong.

Hong Kong residents attend a candle light vigil on June 4, 2019 in honour of the 30th anniversary of the Tiananmen Massacre. Victoria Park, Hong Kong.

Hong Kong residents attend a candle light vigil on June 4, 2019 in honour of the 30th anniversary of the Tiananmen Massacre. Victoria Park, Hong Kong.

Hong Kong residents attend a candle light vigil on June 4, 2019 in honour of the 30th anniversary of the Tiananmen Massacre. Victoria Park, Hong Kong.

Hong Kong residents attend a candle light vigil on June 4, 2019 in honour of the 30th anniversary of the Tiananmen Massacre. Victoria Park, Hong Kong.

Hong Kong residents attend a candle light vigil on June 4, 2019 in honour of the 30th anniversary of the Tiananmen Massacre. Victoria Park, Hong Kong.

Hong Kong residents attend a candle light vigil on June 4, 2019 in honour of the 30th anniversary of the Tiananmen Massacre. Victoria Park, Hong Kong.

Hong Kong residents attend a candle light vigil on June 4, 2019 in honour of the 30th anniversary of the Tiananmen Massacre. Victoria Park, Hong Kong.

Hong Kong residents attend a candle light vigil on June 4, 2019 in honour of the 30th anniversary of the Tiananmen Massacre. Victoria Park, Hong Kong.

Hong Kong residents attend a candle light vigil on June 4, 2019 in honour of the 30th anniversary of the Tiananmen Massacre. Victoria Park, Hong Kong.

Hong Kong residents attend a candle light vigil on June 4, 2019 in honour of the 30th anniversary of the Tiananmen Massacre. Victoria Park, Hong Kong.

Hong Kong residents attend a candle light vigil on June 4, 2019 in honour of the 30th anniversary of the Tiananmen Massacre. Victoria Park, Hong Kong.

Hong Kong residents attend a candle light vigil on June 4, 2019 in honour of the 30th anniversary of the Tiananmen Massacre. Victoria Park, Hong Kong.

Hong Kong residents attend a candle light vigil on June 4, 2019 in honour of the 30th anniversary of the Tiananmen Massacre. Victoria Park, Hong Kong.