Douglas Ross has apologised for using "industrial language" in the Scottish Parliament after he was interrupted by protesters.
The Scottish Conservatives leader was in the process of making a point to Nicola Sturgeon about the controversial deposit return scheme (DRS) when three people in Holyrood's public gallery began shouting about climate change.
Parliament was briefly suspended by the Presiding Officer to allow the trio to be removed by parliament security.
An annoyed Ross could be heard on TV and radio saying "f***'s sake" as he took his seat in the Holyrood chamber.
Once parliament resumed, he said: "I have to say it's getting very tiresome, these constant interruptions to First Minister's Questions.
"We are here, democratically elected, to put questions to the First Minister, and when it gets disrupted like that, people are getting fed-up of that childish behaviour".
It was only when Ross stood up a short time later to ask his final question he apologised for his unparliamentary language.
The Tory MSP said: "Can I begin with an apology - it's been brought to my attention that I perhaps used industrial language in response to the protestors who interrupted the session earlier.
"To you, the chamber, and everyone listening - including my mother - can I apologise for that."
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