BBC newsreaders were forced to get a police escort to the recording studio after getting stuck in London traffic, jeopardising the broadcast of the 6pm news. Studio at Broadcasting House gone down!
The BBC had to run previously recorded content on its live news channel due to the technical issue. "Traffic terrible. Aagghhh", he wrote.
But it appears the traffic was due to a demonstration and the pair ended up being escorted through in a police vehicle.
'Now in a police vehicle being escorted through the demo.
And later he added: "Policeman Josh has saved the day!" @bbcnews should be on air!'
The software's supplier, Annova, has been helping to investigate the fault's cause.
From about 15:00 BST, the BBC News Channel and BBC World News were unable to broadcast live, relying instead on recorded material.
A statement from the BBC said: 'Due to a technical issue we're now running recorded programming on our live news channels.
A spokesperson for the BBC said: "Due to a technical issue we're now running recorded programming on our live news channels".
The channel returned to live broadcasting at 4pm with Brown saying: "Hello there, you're watching Afternoon Live".
A BBC spokesman previously said: "We're working hard to resolve this as quickly as possible".
The BBC website was unaffected by the issue.