An arsonist who started a devastating £4.5 million blaze during a break-in at a ‘beloved’ West Yorkshire school has today been sentenced to life imprisonment.

READ MORE: Shocking pictures show arsonist's £4.7m trail of destruction at school and village library

Aaron Foster’s attack on Ash Green Primary School in Clough Lane, Mixenden, in February came 18 months after he had set light to Mixenden library causing £180,000 worth of damage to a building which had acted as a community hub. Foster, 20, had denied both arson attacks but a jury returned unanimous guilty verdicts following his trial at Bradford Crown Court in July.

In a victim impact statement, head teacher Mungo Sheppard described how ‘one mindless act of arson’ had ripped the heart out of an entire community. In the aftermath of the blaze his hardworking staff had been devastated by what had happened and children who had lost all their work felt ‘heartbroken and confused’.

After taking account of a psychologist’s report and Foster’s ADHD diagnosis, Recorder Simon Myerson KC concluded that he did pose a significant risk of serious harm to members of the public in the future and a discretionary life sentence was therefore appropriate.

He set a minimum term of nine years in custody which Foster will have to serve before he can be considered for release if it is decided it is safe to do so.

The court heard that Foster, of Stanningley Drive, Mixenden, had savings of £15,000 due to a pay-out following an accident, but Recorder Myerson decided not to take that from him by way of compensation.

He said the sum was ‘frankly a flea-bite’ compared to the damage inflicted.

The jury had heard evidence from a woman who said that she had seen Foster smash a window at the library and climb in minutes before she saw flames flickering inside.

She told the court that after the alarms went off Foster came out and followed her back to nearby garden where she said he was ‘laughing about what he had accomplished’.

The witness described how he had said he was after money in the library, but there wasn’t any and he had set the fire to get rid of his fingerprints.

During the trial the jury was shown CCTV footage of Foster breaking into the school on the evening of the blaze.

He was captured on CCTV walking around the school using the torch function on his mobile phone and carrying a lit cigarette.

A subsequent fire investigation suggested that there had been three or four seats of fire.

Prosecutor Camille Morland said the footage showed Foster going into classrooms in the Key Stage Two area and captured the moment the first fire was started.

At one point Foster himself phoned the emergency services claiming to be trapped in the burning school building and the recording of the call was played to the jury.

He claimed his mates had suggested stealing the school iPads to get some money.

“All I can see is flames,” he told the control room operator. “I’m in a hallway. All I can see is flames.”

During cross-examination, Foster was accused of ‘playing the victim’ after he went back into the already burning building and made the 999 call.

After being rescued he denied starting the fires claiming others were responsible.

Recorder Myerson said Foster had a supportive and loving family and he took the view that he had not been motivated out of simple wickedness.

“You are not, I think, a bad person,” he told Foster via a video link to HMP Doncaster.

But arson attacks had had absolutely catastrophic consequences for the community.

“The cost to those children of having their own work destroyed, their environment literally gutted and their peace of mind disturbed by the thought that somebody had come into their building and burned it down, really because it seemed like a good idea at the time, is just incalculable,” he said.

Foster had previous convictions dating back to when he was 17 and he had previously been expelled from a pupil referral unit.

Mr Sheppard said the additional work following the fire had been exhausting and staff had experienced insomnia and nightmares.

The fire had destroyed the Key Stage Two block at the school and it is thought that the pupils would now face another academic year in temporary accommodation.