The first minister has said the Scottish government will do "everything it can" to support workers at bus manufacturer Alexander Dennis.
John Swinney said he was "deeply concerned" the firm was planning to move its full operation to a site in Scarborough, North Yorkshire, putting 400 jobs at factories in Falkirk and Larbert at risk.
However, he faced criticism from Scottish Labour leader Anas Sarwar, who claimed his government had ordered more buses from China than it had from the firm.
Swinney said most bus ordering decisions in Scotland were made by private operators, and the government had to comply with state subsidy rules in the way it supported businesses.
At First Minister's Questions Swinney said: "This issue has been occupying a great deal of the focus and the attention of the deputy first minister and I and the UK government ministers since we became aware of the situation over the last few weeks, and then ultimately to the decision that was announced yesterday."
He quoted a joint letter from the UK and Scottish governments, which pledged to "work closely with Alexander Dennis at this challenging time".