It's been 20 years since a tsunami devastated coastlines and killed an estimated 228,000 people in Indonesia, Thailand and other Indian Ocean nations.
It was triggered by a powerful undersea earthquake.
In the city of Banda Aceh, a siren marked the exact time the undersea earthquake was felt in the province.
People attended an official memorial in the Baiturrahman Grand Mosque.
The ceremony is the first in a series planned across Asia.
Al Jazeera’s Step Vaessen reports from Banda Aceh, Indonesia.
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