Tourists were locked inside the Eiffel Tower and the Eurostar evacuated amid a Paris terror alert which saw one man arrested this evening.

People took to social media to share images of the 324-metre-high tourist attraction shut off and surrounded by police.

One person has been arrested. Initial reports said the person was carrying a weapon, with some social media users mentioning both a 'gun' and a 'knife', but police say these reports are unfounded.

French police said they arrested an unarmed man near the Eiffel Tower on Friday night.

A cordon surrounded the area as officers stopped people from getting close to the landmark.

No-entry signs at the Eiffel Tower in Paris as the landmark was placed on lockdown this evening

People have taken to social media to share images of the popular tourist attraction (pictured) shut off and surrounded by police

Tourists have been locked inside the Eiffel Tower and the Eurostar evacuated amid a Paris terror alert involving someone who was 'acting weird' this evening

A spokesman for police in Paris said: 'A person was arrested, the incident is finished.

'He wasn't armed. We'll know more about his motives tomorrow.'

Bob Thomas said on Twitter: 'Anyone know what is going on at the Eiffel Tower? All been shut down.'

Earlier in the evening the tourist told the Mirror: 'We're stuck in one of the legs outside the lift. We've been locked in.

'Told it's a full lock down. Nothing official yet.

'We are currently locked down at the base outside one of the lifts. Been told a guy was acting weird but no confirmed weapon. The staff have been locked in with us.'

The incident came as another security scare unfolded at the Gare du Nord, where passengers on the Eurostar were evacuated when a 'suspicious item' was found.

Tourist Bob Thomas said: 'We're stuck in one of the legs outside the lift. We've been locked in'

Zoë Grisedale‏ said: 'They have found a suspicious item. We are all to wait outside terminal.'

Eurostar said on social media: 'We regret that for security reasons check-in and border controls will need to be repeated for customers of #ES9063.

'There will be a consequent delay to the departure of #ES9063. Thank you for your understanding.'

Paris-based journalist Charlotte Dubenskij said the Eiffel Tower is now open again.

Just a few weeks ago police arrested a knife-wielding man wearing a Paris Saint-Germain football shirt after he tried to breach security at the Eiffel Tower.

France has been the victim of a string of ISIS-inspired terror attacks in the past two years, most notably the November 2015 atrocities which claimed the lives of 130 people.

Last year, Nice truck terrorist Mohamed Lahouaiej Bouhlel killed 86 people and injured 434 when he drove his truck into a crowd celebrating Bastille Day.

Paris-based journalist Charlotte Dubenskij said the Eiffel Tower is now open again