The "major line of inquiry" is a firework display organised by Taunton Rugby Club.
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Never go near a firework that has been lit, even if it has not gone off.
On 5 November the couple went to a firework display at the pub where Ms Mills worked, then went home.
On Friday, police appealed for information after a firework was thrown into an unoccupied car parked in the Ely area of Cardiff.
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The two-day festival includes family fun days, magic shows, movies and live music, and culminates in a firework display on the river.
The dangers were highlighted at the weekend, when a nine-year-old boy was treated in hospital after a firework went off in his hand in Belfast.
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Mr Middleton, who was at home with his partner and three children heard a series of bangs which he thought was a firework, the jury heard.
Hundreds of people took part in the parade watched by crowds along the route from Monument to the Civic Centre where a firework display was held.
It is also a fineable offence for anyone under the age of 18 to have a firework on them (other than a sparkler) in a public place.
It has been named Sparks in the Park for about 10 years but a firework display has been held at Earlham Park for at least 20 years.
Meanwhile, thousands of people gathered in Red Square in Moscow to witness a firework display at midnight, although alcohol was banned to prevent the festivities getting out of hand.
The ashes of a soldier who died in Afghanistan have been sent up in a firework rocket as part of a display to mark the anniversary of his death.
Balotelli continued to catch attention both on and off the pitch, none more so than in October 2011 after a firework was set off in the bathroom of his home.
Beijing has launched a firework safety index during the upcoming Chinese New Year holidays that advises against setting off fireworks and firecrackers in poor weather conditions, China Daily reports.
Others suggestions included treating friends and relatives to a firework display by mixing the ashes with gunpowder, while some people wanted a small amount of their remains placed in a specially designed locket for their loved ones to wear.
In November 2007, Lewis Colwell almost burnt down a house when he posted a lit firework through the letterbox.
The event was being followed by a midnight firework display on Tyneside's quayside.
From 21:00 on 31 December there will be a one-minute display on the hour until midnight where there will be a longer firework sequence.
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On Monday, WRS said it was investigating the cause of the blaze but it "could have started by accident, perhaps even by a spent firework".
Famously, journalist Hunter S Thompson's ashes were fired into the sky - as per his wishes - in a giant firework, paid for by his friend Johnny Depp.
Witnesses said that a flare or firework lit by band members may have started the fire.
It followed the earlier arrest of a 46-year-old man after a spate of firework-like attacks in the town.
They spent time watching a movie before noticing a backpack containing firework shells, which had been emptied of powder, according to the affidavit.
You take all this very sensitive, hi-tech work - very complex - and you put it on top of a big, big firework.
The operation followed a series of attacks involving what are thought to be homemade firework-type devices.
Beijing Youth Daily says the capital had 83 fire emergencies and 25 firework-related injuries from midnight to 0100, a year-on-year decrease of 44.6% and 28.6% respectively.
It follows Friday's arrest of a 46-year-old man after attacks in Denbigh involving firework-like devices.
Not so for the celebrity set, who can easily afford all the accoutrements of a fairy tale wedding, from ritzy locales to post-nuptial firework displays.
The annual firework display held for several years near Norwich is to become a free event in the city.
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