10 years on, tsunami warning stumbles at the "last mile"

A rose which was thrown into the waters of the Andaman Sea to mark the one-year Indian Ocean tsunami anniversary lies near foot prints in Khao Lak, located in Thailand's Phang Nga province, nearly 110 km (68 miles) north of the resort island of Phuket in this December 26, 2005 file photo. REUTERS/Adrees Latif/Files

BANGKOK (Reuters) - In April 2012, Indonesia's Banda Aceh, the city worst hit by the tsunami that killed at least 226,000 people on Boxing Day ten years ago, received a terrifying reminder of how unprepared it was for the next disaster.

As an 8.6-magnitude quake struck at sea, thousands of residents shunned purpose-built shelters and fled by car and motorcycle, clogging streets with traffic. A network of powerful warning sirens stayed silent.