A police officer has been punched outside Parliament (Image: @CezaryStrzelbi1 /Twitter)

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A police officer has allegedly been punched in the face by a man who is claimed to have approached him outside Parliament.

The attack happened at the House of Commons in the heart of Westminster, central London, at around 3.30pm and a man has been arrested for assault.

Footage and pics on social media shows a man being pinned down by officers following the incident.

Witnesses claim the arrested man was shouting that the handcuffs were too tight.

One witness wrote on Twitter, "Incident outside Parliament's St Stephen's entrance. Man on ground handcuffed."

Another posted: "Policeman attacked outside the Palace of Westminster."

A police officer has been punched outside Parliament
(Image: @CezaryStrzelbi1 /Twitter)

One person said that the road was still closed despite the incident being 'resolved'.

Met Police have confirmed a man has been arrested for assaulting a police officer but have stressed the incident is not thought to be terror-related.

Met Police have confirmed a man has been arrested
(Image: @CezaryStrzelbi1 /Twitter)

Met Police tweeted: "We are aware of commentary on social media about an incident outside Parliament.

" Shortly after 3.30pm, a man was arrested for assault after an officer was punched. The officer was not seriously injured and the incident is not being treated as terrorism."