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An 7.5-magnitude earthquake rattled parts of Indonesia early Monday, causing the country's meteorological agency to warn of a possible tsunami. While the warning was later lifted and there were no immediate reports of casualties, "It felt quite big and caused panic," a phone operator told Reuters. Just last week, officials debuted a new tsunami detection and alert system developed in the aftermath of the tsunami that left 170,000 people dead of missing in the Aceh province four years ago.