India was on high alert as its celebrated 59 years of independence on Tuesday.
Security forces shut all roads leading to the Red Fort in New Delhi, while over 60,000 police and paramilitary soldiers were stationed across the city.
Intelligence reports indicated that Islamic militant groups might be plotting major attacks around the celebrations.
In his Independence Day address to the nation, Indian Prime Minister Manmohan Singh expressed a strong commitment to fighting terrorism.
"India has taken tough measures to ensure that terrorist elements are completely neutralised. Let those who want to hurt us by inflicting a thousand wounds remember that no one can break our will or unity. No one can make India kneel."
He said the terror attacks were undermining his peace initiatives and called for all countries in the region to work together for peace.
"It is obvious that unless Pakistan takes concrete steps to honour the pledge it has made to crack down against anti-India groups operating from any area under its control, the Indian public's support for the peace process will be undermined."
In January 2004, India and Pakistan agreed to start a peace process to end their decades-long rivalry and dispute over Kashmir.
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