India mourns the death of former President Dr. APJ Abdul Kalam

India's flag is flown at half mast at Rashtrapati Bhavan, or the Presidential Palace, as a mark of respect for former President A.P.J. Abdul Kalam who died at the age of 83, in New Delhi.

A convoy carries the flag draped casket of former President A.P.J Abdul Kalam to his residence from Palam airport in New Delhi.

Indians line up to pay tributes to former president A.P.J.Abdul Kalam in New Delhi.

Students observe a moment of silence as they pay tribute to former President A.P.J. Abdul Kalam at CMS School in Lucknow.

An Indian student offers flowers to a portrait of former President A.P.J. Abdul Kalam at CMS School in Lucknow.

Indians light candles and offer flowers before a sand sculpture created on the Bay of Bengal coast to pay tributes to former president A.P.J. Abdul Kalam in Chennai.

Indian President Pranab Mukherjee, foreground, salutes the flag draped casket of former President A.P.J. Abdul Kalam after his body arrived at the Palam airport in New Delhi.

Indian Prime Minister Narendra Modi pays respect after the body of former President A.P.J. Abdul Kalam arrived at the Palam airport in New Delhi.

Indian Prime Minister Narendra Modi, second right, places a wreath as he pays tribute to former President A.P.J. Abdul Kalam after his body arrived at the Palam airport in New Delhi.

Indian Defense forces carry the flag draped casket of former President A.P.J. Abdul Kalam after it arrived at Palam airport in New Delhi, India, Tuesday, July 28, 2015. Kalam, known as the father of the country's military missile program, died Monday after collapsing while delivering a lecture, a top state official said. He was 83.