The man is currently in custody at a Cambridgeshire police station

Monday 11am update: A HIGH-LEVEL probe has been launched after a huge fire ripped through a key regional office of the British Transport Police.
Flames and smoke were seen billowing out of the building, next to Peterborough railway station, at the height of the blaze, at about 4.30am on Saturday.

Up to 30 firefighters from four crews and a turntable ladder were needed to fight the fire, which is being treated as suspicious, but the 1930s building, in Station Road, was wrecked.

No one was injured.

Train services were unaffected, but access to the station from Bourges Boulevard was blocked, leading to long queues on Saturday morning

As an acrid stench filled the air, smoke rose from the shattered windows and soot covered the building with a black film, an investigation by police and fire chiefs got under way.

Transport police chiefs from London arrived in the city for a "Gold Command" meeting at the station on Saturday morning, where they discussed how to carry forward the inquiry into what caused the blaze.

It is believed forensic scientists and specialist dogs were requested.

Scenes of crime officers combed the scene for clues ,and CCTV footage was being examined.

The investigation is expected to last seven days.

Today, scenes of crime officers remain in the area.

Speaking at the scene as the incident was scaled down, station manager for Cambridgeshire Fire and Rescue Service Lynn Betteridge said the building had been "totalled".

He said: "When we arrived, the ground and first floors were well alight. There were flames and smoke coming from the windows.

"We did a really good job preventing the fire spreading to the road.

"Initially, we didn't commit any of our crews for safety reasons. It is a 1930s building and we couldn't guarantee the safety of the floors, so we were in defensive mode.

"Once the ground floor had been sorted, then the crews went to the first floor ,and then we got to the stage of knocking out the hotspots."

They sprayed jets on to the burning building and used a turntable ladder from Dogsthorpe to gain access to the first floor as the staircase was completely destroyed.

Mr Betteridge thanked the British Transport Police staff for their help.

Travellers walking past stopped to stare in amazement at the damaged building.

Caroline Hill (50) was waiting for a train to take her to see a show in London, a birthday treat from her daughter.

Mrs Hill, from Westwood, said: "It looks gutted. It's quite shocking. I'm Peterborough born and bred and know that building.

"We could smell the fire when we came round the corner."

nAnyone with information is asked to call British Transport Police on 0800 405040.