US President Donald Trump said on Tuesday that the US intelligence confirmed that China is moving troops to the border with Hong Kong, appealing for calm amid intensifying pro-democracy protests in the semi-autonomous financial hub.

Taking to Twitter, Trump said, “Our Intelligence has informed us that the Chinese Government is moving troops to the Border with Hong Kong. Everyone should be calm and safe!”.

Chinese state and social media had earlier aired video of security forces gathering across the border from the enclave, which has been rocked by unrest for ten weeks.

India on Tuesday issued an advisory to its citizens for travelling to Hong Kong, a day after flight operations were severely disrupted at the city’s international airport due to public demonstrations.

Airlines including Cathay Pacific asked passengers to postpone non-essential travel from Hong Kong and not proceed to the airport unless they have a confirmed booking.

Meanwhile, scenes of long lines and crowds continued to be seen on Tuesday morning at the airport, which struggled to recover from the protests a day earlier, during which demonstrators sought to draw attention to what they consider police brutality while trying to disperse protests in the city.

On Sunday, an unknown number of police officers were injured after protesters threw Molotov cocktails at them.