London, United Kingdom: Tourists were stuck in mid-air on the popular London Eye attraction for around an hour on Wednesday following a suspected terror attack outside the Houses of Parliament.

Visitors on the London Eye, a 135 metre (443 foot) high big wheel, were later evacuated after the attack, in which a police officer was stabbed and the suspected assailant shot.

The London Eye has a clear view over the area.

"At present we are holding all of our guests within our attractions as per tried and tested security procedures," the attraction said on its Twitter page.

The account later tweeted that the passengers "are now disembarking".

The London Eye is made up of 32 white pods, each of which can carry 25 people.