New Delhi, Feb. 15 -- In a stern message to Pakistan, Prime Minister Narendra Modi on Friday said the terrorists have committed their "worst mistake" by killing 45 CRPF troopers in Jammu and Kashmir and said their backers will pay "a very big price".

Modi's remarks a day after the Pakistan-backed Jaish-e-Mohammad (JeM) claimed responsibility for the Thursday attack in Pulwama.

"We have given complete freedom to the security forces. We have full faith in their bravery and valour," Modi said while addressing a programme to flag off the first indigenous engine-less Train 18, renamed as Vande Bharat Express, at the New Delhi Railway Station.

He said: "The terrorist groups and those who are giving them shelter are responsible and have committ...