Pictures on social media show several armed police guarding a man wearing a hooded top.
It is believe the man may have been in possession of a knife.
BREAKING: Armed police hold man at gunpoint outside Parliament
Parliament has been put on lockdown this morning after armed police detained a man at gunpoint.
By The Newsroom
Friday, 16th June 2017, 12:57 pm
Updated Wednesday, 21st June 2017, 3:19 pm