A Chinese journalist has been arrested in the UK after allegedly slapping a volunteer during an event discussing freedoms in Hong Kong at the ruling Conservative Party's annual conference.

Key points: Volunteer says he was slapped twice

Volunteer says he was slapped twice Video captures part of incident

Video captures part of incident Journalist heard shouting "Hong Kong puppet"

A video posted by NGO Hong Kong Watch and Hong Kong Free Press shows the reporter becoming angry when she is asked to leave the event.

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"At the end of the event, a woman with a press pass, later learnt she works for Chinese state-controlled #CCTV, shouted at @benedictrogers from her seat, accusing him of trying to separate China, and the rest of the panel were puppets and fake Chinese," volunteer Enoch Lieu said on Twitter.

"Fiona Bruce MP asked her to calm down, that woman obv can't, then Fiona asked her to leave. I approached her, and tried to tell her she had made her point and she was no longer welcome.

"The reporter continued her shouting and whilst I was trying to escort her out, she accused me of trying to silence her.

"Then I said no miss you have to go. All of a sudden, she slapped me in my face."

Mr Lieu said he was slapped a second time as people attempted to escort the reporter out of the event.

The video, which appeared to only capture part of the incident, shows the journalist shouting "Hong Kong puppet" and "leave me alone" before she appears to slap one of the people trying to have her removed.

"Police were called to hall 11 at the ICC yesterday at 2.30pm after reports a disturbance had broken out during a talk on Hong Kong," a spokeswoman for West Midlands police said, according to The Guardian.

"A 48-year-old woman from King's Cross, London, was arrested on suspicion of common assault. She remains in police custody."

CCTV demands apology for treatment of its reporter

The Umbrella Movement pro-democracy protests gripped Hong Kong in 2014. ( Reuters: Tyrone Siu )

But Chinese state broadcaster CCTV issued a statement saying it was, "strongly opposed to the UK's violation of the rights of one of its journalists at an event on Hong Kong, and demands an apology".

"CCTV reporter Kong Linlin was blocked and assaulted when she raised a question and expressed her opinion," a spokesperson said.

The Chinese embassy in the UK also blamed the event organisers for the incident.

"It is puzzling that the Chinese journalist should encounter obstruction in such a way and even assault at the fringe event when she simply raised a question and expressed her opinions. This is completely unacceptable," a spokesperson said.

The event, titled The erosion of freedom, the rule of law and autonomy in Hong Kong, was a small meeting at the Conservative Party's conference in Birmingham.

Its speakers included democracy activists and one of the Umbrella movement leaders, Nathan Law, and founder of the Democratic party of Hong Kong, Benny Tai.

The incident follows the unprecedented step by authorities in Hong Kong last month to ban the pro-independence Hong Kong National Party.