The intelligence inputs had warned that terrorist training camps situated at Muridke, Shakurgarh and Narowal have become active and a "substantial number of men and women were camping and undergoing training for terror-related activities."
Intelligence agencies also spotted terrorist training activities in the border district of Narowal in Pakistan's Punjab province, the same district where Kartarpur Sahib Gurudwara is situated.
The corridor, which connects Dera Baba Nanak Sahib in Gurdaspur district of Punjab with the Kartarpur Sahib Gurdwara in Narowal district of Pakistan's Punjab, became operational for Indian pilgrims after Prime Minister Narendra Modi inaugurated it on Saturday, and flagged off the first batch of over 500 Indian pilgrims.
Prime Minister Modi simultaneously flagged off the first lot of high-profile 500 pilgrims to visit Darbar Sahib Gurdwara, also called Kartarpur Sahib, the last resting place of the founder of Sikh faith, Guru Nanak Dev, in Pakistan.
The Indian pilgrims were welcomed by Pakistan's PM Imran Khan, who also inaugurated the other side of the corridor.
India signed an agreement with Pakistan on October 24 on the modalities for operationalisation of the 4.2 km-long four-lane Kartarpur Sahib Corridor at the Zero Point on the international boundary.