The Sikhs demonstrated holding placards and the Indian flag and chanted slogans, “Bharat humara swabhiman hai (India is our pride)."

The protesters said they will not tolerate any insult to the national flag.

Following the crackdown on pro-Khalistan leader Amritpal Singh on Saturday, a bunch of his supporters tried to vandalise the Indian High Commission’s office in London. One of them grabbed the tricolour and removed it from the flag post.

However, an official of the Indian High Commission in London snatched the Tricolour from the Khalistani supporter and threw out the Khalistan banner.

Officials from the mission said the "attempted but failed" attack had been foiled and that the tricolour was now flying "grander," a report in the media said.

The Metropolitan Police said two members of security staff sustained minor injuries which did not require hospital treatment. An investigation has been launched, it added.