Police and ammunition experts have dug out explosives believed to be dating back to World War II.
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Nearby streets have been cordoned off for their disposal.
Ammunition experts believed that the rusted explosive articles, which were first found by drainage workers several metres underground at a work site, were left by Japanese troops during World War II.
Police said that some explosive articles, including grenades and cannon shells, have to be ignited later due to their unstable condition.
Fire fighters and ambulances also stood by.
About 100 explosive articles have been excavated and ammunition experts were still searching for more explosives.