Hong Kong came to a standstill on Tuesday as torrential rain pounded the city for the second time in less than six hours, triggering a rare black rainstorm warning, paralysing public services and flooding key urban districts.

Forecaster issues highest-level storm warning at 5.50am, prompting authorities to suspend all morning and whole-day schools.

Torrential rain has brought Hong Kong to a standstill, with the city issuing a rare Black Rainstorm Warning twice in one day. Streets turned into rivers, residents were trapped in buildings, and emergency services were stretched thin.