In a message issued on Saturday to all water sports, casino and cruise vessels and barges operating on Goa coast and to Director, Tourism Department, Government of Goa, Capt J Braganza, Captain of Ports, FSO, Panaji Port, Goa, said, ''Have received intelligence input from District Coast Guard that anti national elements have boarded a apprehended Indian fishing boat in Karachi and likely to land on Indian coast and attack vital installations.