Certain "foreign forces" are trying to hurt China by creating chaos in Hong Kong over an extradition bill that has prompted mass protests in the former British colony, an official Chinese newspaper said on Monday.

Riot police surrounded Hong Kong's parliament early on Monday after what had been a peaceful million-strong protest against the bill descended into running clashes between police and protesters.

Earlier on Sunday, hundreds of thousands had jammed Hong Kong's streets to protest the bill in the biggest demonstration in years. Many said they feared it put the city's vaunted legal independence at risk.