"A big thank you for the warm welcome in New York! Deeply touched. Looking forward to a great trip ahead," Modi said in a tweet.
Modi is on a five-day visit to the US. He arrived here Friday where he was greeted by hundreds of people who were waiting for him at the Madison Avenue in New York, close to the hotel where he will be staying.
He met New York Mayor Bill de Blasio and US National Cancer Institute Director Harold Varmus.
Modi will address the UN General Assembly Saturday.