India, Sept. 14 -- Prime Minister Narendra Modi and defence minister Rajnath Singh arrived in Kolkata in separate planes on Sunday evening to attend the Combined Commanders' Conference of the armed forces, which begins on Monday.

PM Modi will inaugurate the three-day conference at the Eastern Command headquarters at Vijay Durg, which was earlier called Fort William. He will be attending the conference for around four hours on Monday morning and leave for Purnea in Bihar, Army officials said.

National security advisor (NSA) Ajit Doval will also attend the conference where the chiefs of the Army, Navy and Air Force will be present.

The conference will focus on changing strategic scenarios and operational preparedness, officials said.

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