The so-called 'Million March' from Trafalgar Square to Downing Street descended into chaos as Pakistan Peoples Party (PPP) chairperson Bilawal Bhutto Zardari stepped on to the makeshift stage to speak.
The crowd began booing and throwing empty plastic bottles and refused to let him speak at the march yesterday.
Pakistan Tahreek-i-Insaf (PTI) chairman Imran Khan's nephew, Hassan Niazi, was also involved in the controversy. Niazi was briefly detained by the UK police after the incident, according to a tweet from his official account.
The PPP and the PTI rivalry which was earlier confined to rhetoric of top leaders of the political parties seemed to take a violent turn after the incident at the march.
A PTI office in Hyderabad in the Sindh province came under attack by some political activists, who according to Imran Khan led party were affiliated with the PPP, shortly after Bilawal was forced to cut short his speech by alleged PTI workers at the rally held in London.
"This march was to be about Kashmir and for the welfare of Kashmiris. Bilawal has no business being here," said a group of angry protesters who had travelled from Derby in the
East Midlands region of England.
Following the incident, Bilawal's sister Aseefa Bhutto Zardari tweeted that her brother is safe and alleged that "Indian agents" tried to stop him from speaking but they did not succeed.
People also chanted 'Go Bilawal Go' and 'Go Nawaz Go' as the PPP chairman attempted to take the stage.
Meanwhile, PPP leader Rehman Malik has demanded Prime Minister Nawaz Sharif to take notice of the incident at the rally in London.
He said that Bilawal raised his voice for Kashmiris and had visited London to express solidarity with them.
The march was led by Barrister Sultan Mahmood Chaudhry.
While the pro-Pakistan group had claimed overwhelming support from various communities for the march, others had dismissed it as against the "national interest of the people of Jammu and Kashmir".
Ahead of the march, India had warned that forces inimical to Indo-UK relations may utilise such an opportunity.
However, it had appreciated Britain's stand that the Kashmir issue was to be resolved only by India and Pakistan and said that with this reassurance the government was "quite comfortable" of any march being organised.

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