An urgent investigation is underway after a large chunk of stone fell off one of the Parliament buildings and smashed into a car below.
The slab landed just metres away from the main entrance of Norman Shaw North – an office block used by senior MPs.
A picture was posted on Twitter of the shattered car windscreen and dislodged masonry by Conservative MP Will Quince.
But it was swiftly deleted on the orders of House of Commons bosses for "security reasons".
Mr Quince said: "I appreciate the picture is embarrassing to the Parliamentary Authorities given how serious this could have been had the masonry hit someone."
He came across the fallen stone while walking to the chamber on Wednesday.
"Evidence of why the UK Parliament needs urgent repair," he wrote in the now-deleted tweet.
"This stone fell off the top of a building. Imagine if this had hit someone. Unthinkable."
A House of Commons spokesman told Sky News no-one had been injured and the area had been cordoned off.
Authorities are investigating what happened "urgently", he added.