Labour MP Khalid Mahmood has condemned Wednesday's terror attack on Westminster.
Three members of the public and one police officer died, and up to 40 people were injured after a man mowed down pedestrians on Westminster Bridge before fatally stabbing a police officer within the grounds of the Palace of Westminster.
MPs are due to sit in the House of Commons as normal on Thursday in a gesture of defiance, and Scotland Yard have now confirmed several arrests have been made.
Mahmood, the MP for Birmingham Perry Barr, was in Portcullis House at the time of the attack and was in lockdown for several hours until the police debrief.
He condemned the incident in an interview with Paul Ross.
He said: "We saw it unfolding, we started looking at our phones to see what was going on. I couldn't believe what was happening right in front of us.
"It was a horrific day for everyone and all of my constituents would condemn it.
"It's absolutely deplorable and there's no justification."