The House of Commons and House of Lords have issued a security statement following the incident in Westminster on Wednesday 22 March.
A parliamentary spokesperson said:
"Security of Members, staff and the visiting public is our highest priority. For Parliament to fulfil its democratic function, it is crucial that it remain open and accessible to the public.
While we cannot comment on the specifics of our security, we work closely with the police, security services and others to ensure that our security measures are effective and meet whatever level of security risk Parliament faces. These measures are always, and will continue to be, under constant review.
As is good practice following any significant incident, the Houses in conjunction with the police and other bodies will also be carrying out a review of security around this specific incident.
As this is the subject on an ongoing investigation, we cannot comment further at this time."
Issued at 7pm, Thursday 23 March