Interview with BBC Scotland
The Swedish prime minster has said today that he had no idea that there was an investigation going on, but a 30 year old man was arrested yesterday by Scottish police, working in cooperation with the Swedish Intelligence Service Säpo.
In the early hours of Tuesday morning, in the Whiteinch area of Glasgow, a man was arrested - and police are continuing to search other houses.
So far, both the Scottish and the Swedish police are not giving much away. The Swedish intelligence service, Säpo, do say that the arrest is a result of cooperation between the Scottish and Swedish authorities but for details, they simply refer all questions to Scotland.
Almost three months ago Stockholm was the scene of an attempted suicide bombing, which only killed the bomber himself. And now a new lead has opened up in the Scottish city of Glasgow.
Reevel Alderson, at BBC Scotland, says that some important insights can be gained from what the Scottish police have said so far - that the suspect will be charged under Scottish law, and there are no plans for extradition to Sweden.
"So if he has committed an offence he has committed it in Scotland, and not necessarily in Sweden."
Under British anti-terrorism laws police can hold and question a suspect for 14 days - but in order to hold the man beyond 48 hours the police will need to ask a local judge for permission.
In many terrorism arrests in the UK the investigation ends with a release and no charges. If on Thursday the Glasgow suspect is still in a Scottish cell, then the search for a possible link to the Stockholm bomb will look a lot more hopeful.