New CCTV footage showing a group of people running away after an industrial-sized firework exploded in a man’s house has been released by police eight years after he died in a fresh bid to catch his killers.Tony Nicholls, 56, was seriously injured when a group of people burst into his home in Tile Cross, Birmingham, and set off the firework, which contained around 200 tubes of explosives, in the hallway at around 11.20pm on November 2 2017.