Three children lost their lives on Monday, after being pulled from an icy lake as an Arctic blast sent temperatures tumbling across the UK.

The youngsters were reported to have been playing on frozen ice near Birmingham, central England, on Sunday afternoon, when it gave way and they fell in.

Emergency services said the children went into cardiac arrest when they were rescued and were taken to the hospital in critical condition.

The incident came as the UK was hit by heavy snow and freezing conditions, causing major travel disruption, on the eve of a national rail strike Tuesday that was already expected to bring the country to a grinding halt.

London Stansted airport warned of disruption.&nbsp;

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"Our runway is temporarily closed whilst we undertake snow clearing," it added, with many flights cancelled early Monday.

The airport is the main hub of budget airline Ryanair, which also cautioned about disruption to its flights at Gatwick, south of London.

"Due to ongoing severe snowy weather across the UK, runaways at both Stansted and Gatwick have been temporarily closed tonight (11 December), &nbsp;disrupting all flights scheduled to depart Stansted/Gatwick during this temporary closure period," it said.

Both airports were open on Monday, but passengers were told to brace for delays.

Dozens of stranded passengers posted videos on social media showing snow-covered runways and planes stuck on the ground.

More than 50 flights were also cancelled on Sunday at Heathrow, the UK's largest airport, due to freezing fog.&nbsp;

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Train and bus services in London were also severely affected after the dump of around four inches (10 centimetres) of snow overnight, which also forced the closure of parts of the M25 orbital route around the capital, the country's busiest motorway.

Some schools were also shut.

The UK has been experiencing a cold snap for several days, with temperatures dropping to -10 Celsius degrees (14 Fahrenheit) in some areas, although the Met Office said the temperatures were "not unusual for this time of year".&nbsp;

The service has issued yellow alerts for snow, fog and frost in several areas, including southeast and southwest England, and the north of Scotland.

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Three children lost their lives on Monday, after being pulled from an icy lake as an Arctic blast sent temperatures tumbling across the UK. The youngsters were reported to have been playing on frozen ice near Birmingham, central England, on Sunday afternoon, when it gave way and they fell in.

Three children lost their lives on Monday, after being pulled from an icy lake as an Arctic blast sent temperatures tumbling across the UK. The youngsters were reported to have been playing on frozen ice near Birmingham, central England, on Sunday afternoon, when it gave way and they fell in. Emergency services said the children went into cardiac arrest when they were rescued and were taken to the hospital in critical condition. The incident came as the UK was hit by heavy snow and freezing conditions, causing major travel disruption, on the eve of a national rail strike Tuesday that was already expected to bring the country to a grinding halt. London Stansted airport warned of disruption. Also read | 'Absolutely amazing...but also breaks your heart': Moon the humpback whale travels 5000kms with a broken back "Our runway is temporarily closed whilst we undertake snow clearing," it added, with many flights cancelled early Monday. The airport is the main hub of budget airline Ryanair, which also cautioned about disruption to its flights at Gatwick, south of London. "Due to ongoing severe snowy weather across the UK, runaways at both Stansted and Gatwick have been temporarily closed tonight (11 December), disrupting all flights scheduled to depart Stansted/Gatwick during this temporary closure period," it said. Both airports were open on Monday, but passengers were told to brace for delays. Dozens of stranded passengers posted videos on social media showing snow-covered runways and planes stuck on the ground. More than 50 flights were also cancelled on Sunday at Heathrow, the UK's largest airport, due to freezing fog. Also read | 11,000 children killed or maimed, another 2.2 million malnourished due to war in Yemen: UNICEF Train and bus services in London were also severely affected after the dump of around four inches (10 centimetres) of snow overnight, which also forced the closure of parts of the M25 orbital route around the capital, the country's busiest motorway. Some schools were also shut. The UK has been experiencing a cold snap for several days, with temperatures dropping to -10 Celsius degrees (14 Fahrenheit) in some areas, although the Met Office said the temperatures were "not unusual for this time of year". The service has issued yellow alerts for snow, fog and frost in several areas, including southeast and southwest England, and the north of Scotland. WATCH WION LIVE HERE You can now write for wionews.com and be a part of the community. Share your stories and opinions with us here.

Three boys dead after falling into frozen lake in the UK, police confirm

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Three boys dead after falling into frozen lake in the UK, police confirm