The input was sent through diplomatic channels to the island nation after a through investigation pertaining to the IS case in Coimbatore was carried out by the NIA.
Several people succumbed to their injuries sustained in the blasts, taking the death toll to 359.
National flags were lowered and people bowed their heads as the silence began at 8:30 am local time, the time the first of the attacks occurred on Sunday.
Forty suspects, including the driver of a van allegedly used by the suicide bombers, have been arrested in connection with the attacks which shook Sri Lanka.
The National Tawheed Jamath is suspected of plotting the deadly Easter blasts.
While 10 persons from Karnataka have been confirmed dead, at least seven of them are said to be JD-S workers.
Seven persons had been arrested in connection with the blasts.
'We believe that one of the suicide bombers studied in the UK and maybe later on did his post-graduate in Australia, before coming back to settle in Sri Lanka'
Authorities also released photographs of six suspects, including three women, wanted for their involvement in the attacks and sought information regarding them from the public.
