Hospitals are in chaos after declaring an extraordinary 'critical' incident after flooding wreaked havoc across the capital.

The flash floods across London saw more than double July's average monthly rainfall fall in the space of a few hours.

Cars were left stranded in rising floodwater, Tube stations had to be shut and hospital emergency departments were flooded in the deluge.

London hospitals declared critical incidents as a result of the relentless downpour, reports ITV.

It is claimed that extra staff are having to be called in to help mitigate the crisis.

Whipps Cross said on social media it had suffered "operational issues due to the heavy rainfall", and asked patients to seek an alternative A&E if possible.

A pedestrian crosses through deep water on a flooded road
Flash floods caused chaos across the city

Newham Emergency Department said it had been majorly impacted by rising flood waters with ambulances being redirected.

It said on Twitter : "Our Emergency Department has flooded in some areas. We're still here if you need us but to help us while we fix things please attend a neighbouring hospital if possible. Thank you."

ITV reported that London hospitals had declared a 'critical incident' and more staff were being drafted in to help cope.

A spokesperson for Barts Health NHS Trust said: 'We are experiencing operational issues at Whipps Cross Hospital and Newham Hospital due to the heavy rainfall.

"We are working closely with our local partners to resolve the issues and maintain patient care and - while services remain available for people in an emergency - patients are asked to attend alternative hospitals where they can, to help us put solutions in place as quickly as possible."

Meanwhile, the Met Office earlier declared an amber weather warning for thunderstorms for London meaning that more flooding was likely.

A spokesperson said: "Heavy showers and isolated thunderstorms are likely to cause surface water flooding.

Cars drive through deep water
Residents were caught in the waist-high waters

"Flooding of homes and businesses is likely and could happen quickly, with damage to some buildings from floodwater and isolated lightning strikes.

"Where flooding or lightning strikes occur, delays and some cancellations to train and bus services are likely."

Residents of swathes of the city had been caught out in the flooding with some left in waist-high water inside their homes, while emergency services were scrambled to rescue them.

Dramatic footage shared on social media appeared to show rail stations completely submerged.

At Pudding Mill Lane DLR station in Stratford – one of several to be shut due to flooding – video footage showed torrents of water gushing in.

Roads were left under water in various parts of the capital - from Sutton and Camberwell to Walthamstow and Barking.

Workers at the Stratford Centre scrambled to sweep away water after downpours hit, while flooded underpasses in places such as Walthamstow, Kingston and Worcester Park were impassable.

As well as the shocking scenes at Pudding Mill Lane water poured into Kennington Underground Station in the south of the capital, while Hackney Wick suffered a similar fate.

Covent Garden, Edgware Road, Gants Hill, North Greenwich, Pudding Mill Lane, Stepney Green, Stockwell and Surrey Quays are all closed.

There is also major disruption to and from Liverpool Street station due to flooding, with many services cancelled.