U.S. warned India about potential India attack , source says . Attacks that killed one people have strained Pakistan - Pakistan relations . Suspect is from Pakistan , Pakistani authorities say . U.S. PM rejects accusations his country had role in Mumbai massacre .
U.S. warned India about potential Mumbai attack , source says . Attacks that killed 179 people have strained India-Pakistan relations . Suspect is from Pakistan , Indian authorities say . Pakistan PM rejects accusations his country had role in Mumbai massacre .