A reported explosion at a steelworks in Wales is understood to have left several workers injured.
Emergency services were called to Celsa Manufacturing on East Moors Road in Splott at 10.30am. The site has been evacuated and seven fire engines are at the the scene, South Wales Fire and Rescue Service said.
The plant is thought to employ around 500 staff.
Following reports of an explosion at 10.30am this morning, South Wales Police is currently in attendance at the scene of an industrial incident in the steelworks on East Moors Road.
The Welsh Ambulance service also attended the scene.
Witnesses have described the terrifying moment the "whole building shook" in what is believed to be an explosion at the steelworks.
Fire crews and ambulances are continuing to arrive at the Celsa steelworks plant in Cardiff.
James Burniston was at the scene and said he heard a "huge bang".
We were inside the office, and heard huge bang. The whole building shook. I came outside and we saw smoke billowing into the sky.
The area has been evacuated by emergency services.
Thousands of homes have been left without power and rail passengers are facing lengthy delays after Storm Barney battered the UK over night.
In the West Midlands, 2,500 homes lost their electricity supply, according to Western Power Distribution, and Welsh residents have also been badly affected.
In North and Mid Wales, about 6,000 homes were left without power when the gale-force winds hit.
Scottish Power said its engineers worked hard throughout the night to tackle the problem, with just 150 customers waiting to be reconnected on Wednesday morning.
Rail services were hit by trees blown on to lines and overhead power cables, affecting several services in Birmingham, Staffordshire, Bedford and London, according to National Rail.
The highest winds were recorded on Tuesday at 83mph in coastal areas of North Wales, while gusts of 66mph registered in the villages of Weybourne in Norfolk and Wittering, near Peterborough in Cambridgeshire.
The second storm to bear a human name, coming hot on the heels of Storm Abigail, brought gusts strong enough to fell a metal advertising tower at The Fort Shopping Park in Birmingham, although nobody was hurt.
A fallen tree near Bishop's Stortford in Hertfordshire caused delays of around an hour on the route between London Liverpool Street and Stansted Airport, with buses being laid on instead.
London Midland said fallen trees had halted all its rush-hour services between Lichfield in Staffordshire, Coseley in the West Midlands, and Birmingham.
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