The fire started around 7pm on Christmas Eve in a shed at the MP's office at Ballards Lane in Finchley, north London.

Police and the London Fire Brigade were called to the scene.

The Metropolitan Police said the cause of the fire was being investigated "as it is believed it may have been started deliberately".

The force added there were no reports of any injuries.

Mr Freer told the PA news agency that the rear of the building had been damaged.

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He said the response from police and the fire brigade was "excellent" and they were "on site in minutes".

"The police are still investigating and checking out CCTV footage. Until the suspects are caught we won't know the motivation.

"Luckily no one was in the office at the time," he added.

The Finchley and Golders Green MP has represented the constituency since 2010 and is parliamentary under-secretary at the Ministry of Justice.