Engineers have launched an investigation into a technical problem which put porn on to the Scottish Parliament's internal TV system.
Engineers are investigating the porn claim at the Scottish Parliament
Adverts for adult channels, such as Playboy TV and Spice Extreme, began to appear on 320 TV monitors at the Holyrood complex over the weekend.
When viewers scrolled through the list of channels, they appeared as options but could not be accessed.
A Holyrood spokeswoman said the channel labels had been added by mistake.
She said that the TV feed supplier, Telewest, had been asked to remove them. The system also provides coverage of parliamentary meetings and committees.
The spokeswoman said: "The channels have been removed and we are now in the process of trying to upload the channels we should have."
She said the glitch happened when the TV supplier refreshed the boxes of customers in the Edinburgh area over the weekend.
"There is no way anybody could watch porn in parliament - it just isn't happening," she added.
The glitch meant that at 2200 BST on Sunday 10-minutes "teasers" would have appeared for the adult channels.
But the system was taken down at 2130 BST to prevent that. The spokeswoman said: "There is absolutely no way anyone could watch anything inappropriate."