"This is because our Prime Minister Narendra Modi (that) I am here. He saved me. This evening he talked to me when I was at the Kabul Airport. Possibly, he took a lot of interest in rescuing me," Kumar told reporters after arriving at Delhi airport here this evening.
Earlier, the announcement of the release of the 47-year-old private aid worker from Tamil Nadu was made by Prime Minister Narendra Modi through tweets.
"Have spoken to Father Alexis Prem Kumar. Informed happy family of Father Alexis Prem Kumar of his safe return after 8 months in captivity," he added.
Prem Kumar was abducted in Herat province in western Afghanistan by unidentified gunmen on June 2 last year.
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"The matter of his release has been pursued by our leadership, including at the highest levels by the Prime Minister," External Affairs Ministry spokesman Syed Akbaruddin said.
"Father Alexis Prem Kumar is now back in the safety of his homeland and arrangements are being made for him to rejoin his family soon," he added.
At the time of his abduction, Prem Kumar was working with the Jesuit Refugee Service, an international NGO, and was engaged in the educational field in Afghanistan.
He was its Afghanistan Director and had been in the country for over three years.
He had accompanied teachers on a visit to a JRS-supported school for returnee refugees in Sohadat village, 25-km from the city of Herat. He was kidnapped from the school as he was about to return to Herat, the JRS had said then.
Four days after the abduction, Afghan authorities had announced that three Taliban members had been arrested in connection with the case.