Anthony Nicholls died in hospital days after a firework was posted through his letterbox

These pictures show the devastation inside a gutted house where a father was killed after a commercial firework was posted through his letterbox in an incident police are treating as murder.

Neighbours claim Anthony Nicholls desperately tried to smash windows so that he and his partner Marie, 50, could escape the flames which left the walls blackened and a TV melted.

Police say the blaze started when a lit box of fireworks containing 200 tubes of explosives - normally used at outdoor public displays - was put through the door of his home in Birmingham.

The 56-year-old was rescued by firefighters who raced to the property after receiving a 999 call at 11pm last Thursday.

The former hardware store worker was rushed to hospital with 60 per cent burns and placed in an induced coma after the blaze ravaged his property.

But West Midlands Police said Mr Nicholls never regained consciousness and detectives had now launched a murder inquiry.

His partner Marie is still being treated for fractures to her legs after jumping from a first floor window.

Mr Nicholls' have described him as a 'fun-loving, funny man' who 'worked hard all his life'.

Neighbours reported hearing Mr Nicholls screaming for help and trying to break the windows in a desperate bid to escape.

The former hardware store worker was rushed to hospital with 60 per cent burns and placed in an induced coma after the blaze ravaged his property

This picture of a blackened staircase inside the property shows the devastation caused by the commercial firework

A blue forensic tent could be seen outside the £150,000 semi-detached property on Saturday, which has been left badly damaged by the fire

A blue forensic tent could be seen outside the £150,000 semi-detached property on Saturday, which has been left badly damaged by the fire.

Neighbours living on the quiet residential street described seeing paramedics frantically working on Mr Nicholls.

One elderly woman, who did not want to be named, said: 'It's really shocking because this is usually a nice quiet area.

'I've been told somebody put lit fireworks through their letterbox. They were both in bed asleep and Marie jumped from the window.

'People were saying they could hear fireworks going off in the night and that they sounded very close.

'Its despicable that somebody could do such a thing. He used to work at the hardware shop over the road but gave up because of his health.'

The commercial firework was posted through the letterbox of Mr Nicholl's home in Birmingham

Neighbours living on the quiet residential street said described seeing paramedics frantically working on Mr Nicholls

Mr Nicholls' friend Janet Mahoney, 73, said: 'He really is a nice chap - anyone who spoke to him would say the same thing. I knew him from the shop he worked in. It really is shocking and I'm so so sad for Tony - I spoke to him only three days before the fire.'

Detective Inspector Paul Joyce of West Midlands Police said: 'The impact would have been terrifying for the occupants and I would urge anyone who sold or is missing a firework of this size to get in touch.

'This would have been a large heavy firework that would have been difficult to carry some distance, so I would ask anyone who saw someone carrying a large box in the area last Thursday night to contact us.

'Any information no matter how insignificant if may seem to you could help our investigation.

'Sadly one of the victims of this fire has died and our thoughts are with his family and partner at their time of loss.

'His death means that we are now treating this as a murder enquiry and I would like to re-emphasise the need for anyone with information to call us.

'We are following up several active lines of enquiry and are focusing on CCTV from the local community. If you have any home CCTV that we have not yet seen please call us.'

Officers believe the firework, which gutted the home's interior, would have taken two minutes to fully discharge and are asking for help in tracing where it came from.

Mr Nicholls' partner, named as Marie, is believed to have broken both legs jumping from the bedroom window after they were awoken by the blaze on Thursday night

Mr Joyce added: 'The impact would have been terrifying for the occupants and I would urge anyone who sold or is missing a firework of this size to get in touch.

'This would have been a large heavy firework that would have been difficult to carry some distance, so I would ask anyone who saw someone carrying a large box in the area last Thursday night to contact us.

'Any information no matter how insignificant if may seem to you could help our investigation.'