Minutes after the news of Payne's death broke, distraught fans -- most in their 20s and 30s -- gathered near the scene in the Argentine capital, where medical teams were at work.
Nuclear-armed India and Pakistan are bitter adversaries with longstanding political tensions, having fought several wars and numerous smaller skirmishes since they were carved out of the subcontinent's partition in 1947.
Separatist militant groups in Balochistan regularly target natural resource extraction projects dotted across the mineral-rich province, the poorest in Pakistan.