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In one recording released by US authorities, a teacher at Sandy Hook Elementary School tells emergency operators she has heard shooting.
"It sounds like there are gunshots in the hallway. I'm a teacher at the school," she says.
"Keep everybody calm, get everybody away from the windows," she is told. "Try to lock down the school, OK?"
A flood alert has been issued by the Environment Agency for the River Trent and tributaries from Cromwell Weir to the Humber Estuary.
In one of the recordings released, a distressed caller is heard saying: "I think there’s somebody shooting in here at Sandy Hook School."
"What makes you think that?" she is asked.
"Because somebody's got a gun. I saw a glimpse of somebody, they're running down the hallway," she replies.
"They're still running, they're still shooting."
In an emergency call from Rick Thorne, whose job title at the time was Acting Head Custodian at Sandy Hook, gunshots are heard as he pleads "it's still going on!"
"I keep hearing shooting. I keep hearing popping," he tells the operator.
Thorne also describes how he thinks the gunman entered the building: "The front glass is all shot out. It kept going on," he says.
During the call the operator is heard asking a colleague to alert state police to the "active shooter".
Towards the end of the recording, loud bangs are heard in the background. This has been edited out of the clip above.
A major traffic route into Leeds city centre will be closed tomorrow following warnings of high winds.
The Council has taken the decision to shut the road past the Bridgewater Place tower - the tallest building in Yorkshire - after predictions that wind speeds in the area could reach 75mph tomorrow morning.
The move follows a recommendation made yesterday by a coroner at the inquest into the death of Edward Slaney who was hit by a lorry that flew through the air in windy conditions in March 2011.
Read more on the ITV News Calendar website.
Pockets of the UK are expected to be plunged into the worst of the winter weather, with gale-force winds and snowfall expected this week.
The Met Office has issued several weather warnings, having told people in parts of Scotland and northern England they could face a short, sharp, stormy spell of weather over the next 48 hours with the worst of it is expected to clear by the weekend.
See the latest forecasts on the ITV Weather page.
The Labour leader Ed Miliband has defended his 'uncool' music tastes saying it is better to be blasted for not following the Zeitgeist than letting spin doctors decide what his preferences should be.
Never thought I'd be asked to write for NME, but here is my debut. http://t.co/6Mkx0tvsvK
In an article in NME (£) following on from his Desert Island Discs appearance Mr Miliband writes that: "I know choosing A-ha and Robbie Williams doesn't make me the coolest kid on the block.
"No committee of spin doctors would have chosen either of those. I did it, though, because they reminded me of some of the most important moments in my life."
Some of his choices on the Radio 4 show included:
A-ha - 'Take On Me'
Neil Diamond - 'Sweet Caroline'
Robbie Williams - 'Angels'
Josh Ritter - 'Change of Time'
Edith Piaf - 'Non, Je Ne Regrette Rien'
When David Cameron appeared on the show in 2006 he was accused of letting spin doctors choose some of the bands, like The Smiths and Radiohead, in an attempt to make him look more credible.
Gales of more than 90mph are expected to batter exposed and higher areas across the UK.
The Met Office has issued a weather warning for the severe winds from 2am until 4pm on Thursday.