NEW DELHI- In the backdrop of the Islamic State of Iraq and Syria (ISIS) declaring war on various countries including India, the internal security establishment has already begun preparing for a threat. While intelligence agencies are closely tracking developments in the Middle East along with mounting surveillance on Indians reported to be fighting alongside ISIS in Iraq and Syria, the major concern for Ministry of Home Affairs (MHA) is a spillover of the sectarian strife in the region to India. "The issue has been discussed within the ministry and apprehensions about a conflict between Shias and Sunnis erupting in the immediate future or later in the country are not being ruled out. An advisory in this regard has already been sent to various states but more preparations are on,” a senior home ministry official informed. ISIS commander Abu Bakr al-Baghdadi is revealed to have called on believers to take up arms and terrify the enemies of Allah in various countries. Home Minister Rajnath Singh held a meeting with the policy division of the ministry where he asked for a revision and strengthening of the security at vital installations. He also requested the strengthening of VIP security.