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International efforts are under way to help India as the country suffers critical oxygen shortages amid a devastating surge in Covid cases.

The UK has begun sending ventilators and oxygen concentrator devices. EU members are also due to send aid.

The US is lifting a ban on sending raw materials abroad, enabling India to make more of the AstraZeneca vaccine.

India's capital Delhi has extended its lockdown as overcrowded hospitals continue to turn patients away.

The government has approved plans for more than 500 oxygen generation plants across the country to boost supplies.

Meanwhile neighbouring Bangladesh has announced that it will close its border with India from Monday to prevent the spread of the virus.

India reported 349,691 more cases in the 24 hours to Sunday morning and another 2,767 deaths, however the true figures are thought to be much higher.

The first consignment of aid left the UK on Sunday and is due to arrive in India on Tuesday. Further shipments will take place later in the week.

The aid includes 495 oxygen concentrators - which can extract oxygen from the air when hospital oxygen systems have run out - as well as 120 non-invasive ventilators and 20 manual ventilators.

"We stand side by side with India as a friend and partner during what is a deeply concerning time in the fight against Covid-19," UK Prime Minister Boris Johnson said in a statement.

The spike in infection has led to the cancellation of a planned visit by Mr Johnson to India and to a travel ban. Other nations, including the UAE, Canada, Germany and the Netherlands have also banned flights from India.

Sights you never thought you’d see. An oxygen tanker with police escorts. More precious than gold. #india #covid19 pic.twitter.com/6hkTiH8iLF

The White House says it will immediately provide raw materials for vaccines to Indian vaccine manufacturers.

"Just as India sent assistance to the United States as our hospitals were strained early in the pandemic, we are determined to help India in its time of need," said President Joe Biden.

It follows calls by Indian officials and the Serum Institute of India (SII) for the US to lift export controls on raw materials for vaccines that were put in place in February.

Washington has also been criticised for delaying a decision on sending surplus vaccine doses abroad. The US has millions of unused doses of the AstraZeneca vaccine, which has not yet been approved for use there. Top infectious diseases expert Dr Anthony Fauci said the option of sending them to India was being considered.

The US will also provide medical equipment and protective gear. France meanwhile says it will provide oxygen.

In Brussels, the European Commission said it planned to send oxygen and medicine too. Its head Ursula von der Leyen said the organisation was "pooling resources to respond rapidly to India's request for assistance".

India's neighbour Pakistan - which has tense relations with Delhi amid territorial disputes - offered medical equipment and supplies and its Prime Minister Imran Khan tweeted prayers for a "speedy recovery". The country's Edhi foundation has also offered to send a fleet of 50 ambulances to India.

Today we have sent the first of several urgent deliveries of surplus medical equipment to our friends in India to help provide life-saving care for vulnerable Covid patients. No-one is safe until we are all safe. pic.twitter.com/HOudeYv86c

In Delhi - a region of about 20 million people - hospitals are full and are turning away new patients. At least two hospitals have seen patients die after oxygen supplies ran out.

Relatives of sick people are appealing on social media for hospital places, oxygen supplies and ventilators. Some streets outside medical facilities have become crowded with the seriously ill, their loved ones trying to arrange stretchers and oxygen supplies for them as they plead with hospital authorities for a place inside.

Meanwhile testing capacity has also been overwhelmed and crematoria are working around the clock.

Jayant Malhotra has been helping at one crematorium in Delhi.

"I've never seen such a terrifying situation. I can't believe we're in the capital of India. People aren't getting oxygen and they're dying like animals," he told the BBC.

Similar scenes are playing out in other major cities. In total India has confirmed nearly 17 million infections and 192,000 deaths. Some states and territories have imposed lockdowns and other restrictions.

Health officials say more infectious variants have been driving the surge in infections, including the UK variant which has been found in Delhi, and a variant first detected in India in October.

There has been growing criticism of Prime Minister Modi's government for the country's lack of readiness for the second wave. Large religious gatherings and political rallies have been taking place.

On Sunday in a radio address Mr Modi said: "We were confident, our spirits were up after successfully tackling the first wave, but this storm has shaken the nation."

He also tweeted his condolences after it emerged that a famous classical Indian music singer, Rajan Mishra, had died in Delhi after suffering Covid-related health complications.

India's government has confirmed it asked Twitter to block tweets that were critical of the authorities' handling of the crisis, saying the tweets had contained misinformation and were against Indian law.

The social media platform blocked dozens of tweets from being seen in India - among them were tweets from a lawmaker named Revnath Reddy, a minister in the state of West Bengal named Moloy Ghatak and a filmmaker named Avinash Das, Reuters reported.

Meanwhile a newspaper group said it was suspending coverage of the country's flagship domestic cricket competition, the Indian Premier League, saying it was "incongruous" for the competition to be going ahead amid the surge.

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