NEW DELHI: Intelligence agencies have alerted the police in Delhi and Punjab that there may be attempts to disturb communal harmony by pro-Khalistan elements who are likely to carry out an attack on Amritpal Singh of “Waris Punjab De” group and try to flare up sentiments in its aftermath.The agencies have also warned about the terrorist outfit, Sikhs for Justice (SFJ), threatening to storm the IGI Airport building in Delhi with Khalistani flags and unfurl one on top ahead of the G20 summit.An intel alert reads: “Anti-national elements have plans to carry out an attack on Amritpal Singh of ‘Waris Punjab De’ to cause him physical harm. No further indicators as to the identity of persons to carry out the attack, intended place of attack or the mode of attack is available so far.”“Representative of Punjab Police submitted that field formations have already been alerted to take necessary measures. Representative from Delhi desired that financial activities of all district presidents of his group be monitored to check the flow of funds from abroad,” the intel note further reads.Regarding SFJ’s threat to the Delhi airport, the intelligence has asked the authorities concerned to step up security. SFJ founder Gurpatwant Singh Pannun had earlier released a video in this regard.SFJ operatives had spray-painted graffiti in several localities of west Delhi just a week ahead of Republic Day this year. Investigation has led the cops to identify a father-son duo based in the US who are close associates of Pannun.“The two had sent money to the foot soldiers for the act, the probe has revealed. The US-based suspects were even arrested for attacking an Akali Dal leader in America in 2018,” said an official.Delhi Police’s Special Cell had arrested two men — Vikram Singh and Balram Singh — who worked as drivers for a prominent hotel in Aerocity. Pannun had promised to pay Rs 2 lakh but the duo was paid only Rs 2,000.