NEW DELHI: The carnage at Wagah may have announced the arrival of the suicide bomber to the westernmost tip of Pakistan, deep inside "safe and secure" Punjab, but for India, it was a close call as the bomb exploded just a day before hundreds of Sikh pilgrims were to cross over from Amritsar to Lahore for Guru Nanak’s birthday.Nanak Dev’s birthplace, Nankana Sahib near Lahore, is one of the holiest shrines of Sikhism, and despite the air of distrust between the two countries, Pakistan had gone out of its way to issue visas to the pilgrims.Meanwhile, a day after the suicide bomber killed 59 and injured 200, Pakistani authorities said they were still ascertaining which group among the dozens of extremist outfits active inside the state would have carried out the act. While the Pakistani media speculated if the Wagah bombing marked the beginning of shifting of the theatre of terror from Pakistan’s eastern border to the west, experts in New Delhi suspected the bomber may have India in mind before he detonated the 12 kg of explosives strapped to his vest. Lashkar-e-Toiba , the group that carried out the 26/11 attack in Mumbai, Jaish-e-Mohammed led by militant cleric Maulana Masood Azhar , and the newly-formed South Asian affiliate of Al-Qaeda all are potential non-state actors preparing to operate along the Indo-Pak border.Sources in the Indian security establishment told ET that the attack could have been a fallout of internal differences within the Pak establishment."That the attack occurred in such a high security zone points out that it could have been a fallout of schisms within the Pakistani apparatus. This section of the Pak establishment wanted to create further mistrust and rift between Delhi and Islamabad. It appears the target of the bomber was India with collateral damages across the border, but he exploded due to some miscalculation," a government source said.The sound of the explosion was heard well 2 km inside the Indian territory. Sources said the aim of the attack was to vitiate the atmospherics between the two countries and Delhi does not rule out more such attacks in future. Its timing is also under the scanner coming close on the heels of Muharram celebrations on Tuesday. Sources said Hafiz Saeed-led Jamaat-ud-Dawa had taken this opportunity to provide relief to the injured of Sunday’s attack with a view to gaining sympathy for the group.