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Washington, Feb 27: President Donald Trump has said that the US' relationship with India is "extraordinary" right now and a lot of progress was made in bilateral ties during his maiden official visit to the country where America will be doing a lot of business.

Talking to reporters, after his return from India on Wednesday, Trump said, "He (Prime Minister Narendra Modi) is a great gentleman, a great leader. It's an incredible country."

President Trump visited India from February 24 to 25. He was accompanied by first lady Melania Trump, daughter Ivanka Trump, son-in-law Jared Kushner and the top brass of his administration, including national security advisor Robert O'Brien.

They visited Ahmedabad, Agra and New Delhi before leaving for Washington on Tuesday.

During his stay, he addressed a massive rally in Ahmedabad, visited Agra and held official meetings in New Delhi.

The US President was feted at the world's largest cricket stadium in the "Namaste Trump" event in Ahmedabad and was cheered by tens of thousands of people.

"We were treated very, very well and we really enjoyed it. A lot of tremendous progress was made in terms of relationship - our relationship with India is extraordinary right now," he said.

"We are going to be doing a lot of business with India, they are sending billions and billions of dollars now to the United States," Trump said in response to a question.

In a tweet, his daughter Ivanka said that, Trump announced that US international development finance corporation "will establish a permanent presence in India to strengthen our economic ties, improve development plus further women's economic empowerment through WGDP (Women's Global Development and Prosperity Initiative)!"

On her arrival from India, she thanked PM Modi for "your warm hospitality as we visited your beautiful country and celebrated the strength, spirit and unity of the US and India!"

"Throughout our visit we saw monumental achievements of human creativity and proof of the infinite capacity of the human heart!" she said.

The first lady tweeted two pictures of her with Trump facing the Taj Mahal in Agra.

"One of the Seven Wonders of the World, the breathtaking Taj Mahal!" she said.

President Trump "reaffirmed the strong strategic partnership, vibrant economic ties and expanding security relationship between our two countries. Wonderful trip, but glad to be home! Thank you India!" said White House press secretary Stephanie Grisham.

During the visit, India and the US on Tuesday finalised defence deals worth $3 billion under which 30 military helicopters will be procured from two American defence majors for Indian armed forces.

The deals will include procurement of 24 MH-60 Romeo helicopters by India from the US at a cost of $2.6 billion. Another contract to acquire six AH-64E Apache helicopters for $800 million from the US is also on the table.

Feb 22: Prime Minister Narendra Modi is unlikely to accompany US President Donald Trump and his family members during their visit to the Taj Mahal in Agra on Monday, official sources said.

The US President will arrive in Ahmedabad at around noon on February 24 for a less that 36-hour visit to India. He will be accompanied by a high-level delegation including First Lady Melania Trump, the President's daughter Ivanka Trump, son-in-law Jared Kushner and a galaxy of top US officials.

After attending an event at Ahmedabad, the Trumps will travel to Agra on Monday afternoon to visit the Taj Mahal before arriving at the national capital for the main leg of the visit.

When asked about reports that Modi may accompany Trump to Agra, official sources said there was no such plan.

They said the visit to the Taj Mahal in Agra by the US President and his family members will afford them the opportunity to view the historical monument suitably. Therefore, no official engagements or presence of senior dignitaries from the Indian side is envisaged there, the sources said.

New Delhi, Fevb 10: Of the countries most at risk of importing coronavirus cases, India ranks 17th, researchers have found on the basis of a mathematical model for the expected global spread of the virus that originated in China's Wuhan area in December 2019.

So far, India has reported three coronavirus positive cases -- all from Kerala.

Among the airports in India, the Indira Gandhi International Airport in New Delhi is most at risk, followed by airports in Mumbai, Kolkata, Bengaluru, Chennai, Hyderabad and Kochi, according to the model.

The new model for predicting global novel coronavirus cases has been developed by researchers from Humboldt University and Robert Koch Institute in Germany.

"The spread of the virus on an international scale is dominated by air travel," said the study.

"Wuhan, the seventh largest city in China with 11 million residents, was the relevant major domestic air transportation hub with many connecting international flights before the city was effectively quarantined on January 23, 2020, and the Wuhan airport was closed. By then the virus had already spread to other Chinese provinces as well as other countries," it added.

The researchers said that it is possible to estimate how likely it is that the virus spreads to other areas by looking at air travel passenger numbers.

"The busier a flight route, the more probable it is that an infected passenger travels this route. Using these probabilistic concepts, we calculate the relative import risk to other airports. When calculating the import risk, we also take into account connecting flights and travel routes that involve multiple destinations," said the study.

The top 10 countries and regions at risk of importing coronavirus cases are: Thailand, Japan, South Korea, Hong Kong, Taiwan, USA, Vietnam, Malaysia, Singapore and Cambodia, according to the model.

While Thailand's national import risk is 2.1%, it is 0.2% for India, found the research.

The foundation of the model is the worldwide air transportation network (WAN) that connects approximately 4,000 airports with more than 25,000 direct connections.

The model accounts for both, the current distribution of confirmed cases in mainland China as well as airport closures that were implemented as a mitigation strategy.

This network theoretic model is based on the concept of effective distance and is an extension of a model introduced in the 2013 paper "The Hidden Geometry of Complex, Network-Driven Contagion Phenomena" published in the journal Science.

The current outbreak of the 2019-nCoV virus started in Wuhan city, Hubei province, China. While the first cases were reported as early as December 8, 2019, the outbreak gained global attention on December 31, 2019, when the World Health Organization was alerted to "several cases of pneumonia" by an unknown virus.

The new virus was soon identified as a novel coronavirus and named 2019-nCOV. It belongs to the family of viruses that include the common cold and viruses such as SARS and MERS. On January 20, 2020, it was confirmed that the coronavirus can be transmitted between humans, greatly increasing the risk of a global spread.

The death toll due to the novel coronavirus outbreak in China has increased to 811 on Sunday, surpassing that of the Severe Acute Respiratory Syndrome (SARS) epidemic in 2003.

Although about 20 countries have confirmed cases, China has accounted for about 99 per cent of those infected. The first foreign victims of the virus both died on Saturday in Wuhan.