India has launched a long-range intercontinental ballistic missile able to carry a nuclear warhead, say media.
The locally-developed Agni-V missile was originally scheduled to have been launched on Wednesday in the eastern state of Orissa.
Defence officials had delayed the launch until Thursday because of heavy lightning in the area.
The missile has a range of more than 5,000km (3,100 miles), within range of targets in China.
Analysts say the Agni (meaning "fire" in Hindi and Sanskrit) missile family is to be the cornerstone of India's missile-based nuclear deterrent.
The missiles are among the country's most sophisticated weapons.
In 2010, India successfully test-fired Agni-II, an intermediate-range ballistic missile with a range of more than 2,000km (1,250 miles).
The Agni-V missile was launched from Orissa's Wheeler Island at 0805 on Thursday.
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