On 26 Nov 2008 terrorist attacks took place in Mumbai. the attacks were more than ten coordinated shooting and bombing attacks across Mumbai, India's largest city, by Islamic extremists from Pakistan.[The attacks, which drew widespread condemnation across the world, began on 26 November 2008 and lasted until 29 November, killing at least 200 people and wounding at least 308..

Eight of the attacks occurred in South Mumbai: at Chhatrapati Shivaji Terminus, the Oberoi Trident,[7] the Taj Mahal Palace & Tower,[7] Leopold Cafe,[7] Cama Hospital,[7] the Orthodox Jewish-owned Nariman House,[8] the Metro Cinema,[9] and a lane behind the Times of India building and St. Xavier's College.[7] There was also an explosion at Mazagaon, in Mumbai's port area, and in a taxi at Vile Parle.[10] By the early morning of 28 November, all sites except for the Taj hotel had been secured by Mumbai Police and security forces. An action by India's National Security Guards (NSG) on 29 November resulted in the ...more

On Nov 26th, 2008 terrorist was attacked on Mumbai.

Terrorists came to India because of loose security & then they did their assigned work.
After which they were killed by our squads but still 1 file is pending.

Is there any cause of doubt?

Thanks to Lumpen,
2nd The terrorist attack on mumbai on 26.11.2008

Indian constitution was adopted by constituent assembly in 1949.