Police in Angola say four people have been killed and more than 500 arrested in two days of protests sparked by a rise in fuel prices.

Outraged residents took to the streets of the southern African nation when a taxi strike descended into chaos.

Angola's government said on Wednesday that the death toll from violent protests against a fuel price hike had risen to 22 from the previous day's estimate of four. The unrest broke out on Monday when minibus taxi associations launched a three-day strike against a government decision to increase the price of diesel by one-third,