TAIPEI—Deadly explosions caused by a gas leak overnight killed at least 25 people and injured 257 in the southern Taiwanese city of Kaohsiung, according to government officials.

Underground explosions in Taiwan's second-largest city triggered fires that ripped off manhole covers on roads and cratered large boulevards, local television footage showed. Roads exploded with flames, overturning cars and collapsing houses. Many streets are still littered with rubble and impassible by ambulances.

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