The government on Tuesday urged Hongkongers planning to travel to the United Kingdom, or those who are already there, to be careful given the ongoing protests and riots there.

The amber outbound travel alert – the lowest in a three-tier warning system – is currently in effect for Britain.

It means there are signs of threat and people visiting should "monitor the situation, exercise caution, attend to personal safety, avoid large gatherings of people and pay attention to local announcements on the latest situation."

The Security Bureau said it will continue to closely monitor the situation and asked any Hong Kong residents who need help to contact the Immigration Department or reach out to the Chinese Embassy in the UK.