The winning numbers in South Africa's national lottery have caused a stir and sparked accusations of fraud over their unusual sequence.

Tuesday's PowerBall lottery saw the numbers five, six, seven, eight and nine drawn, while the Powerball itself was, you've guessed it, 10.

Some South Africans have alleged a scam and an investigation is under way.

Winning numbers in South Africa's national lottery spark accusations of fraud over their unusual sequence https://t.co/EJmB81XfJR

— BBC News (World) (@BBCWorld) December 2, 2020

The organisers said 20 people purchased a winning ticket and won 5.7m rand ($370,000; £278,000) each.

Another 79 ticketholders won 6,283 rand each for guessing the sequence from five up to nine but missing the PowerBall.

"Congratulations to tonight's 20 winners of the PowerBall draw," lottery operator Ithuba tweeted, adding: "These numbers may be unexpected, but we see many players opt to play these sequences."

Congratulations to 20 new multimillionaires who each won over R5 million on the PowerBall jackpot! 5, 6, 7, 8, 9, 10 🙌 🤑 What will your winning numbers be? Check your tickets now to see if you’re a winner #FestiveYamaMillions pic.twitter.com/7DYpDjTL4R

— #PhandaPushaPlay (@sa_lottery) December 2, 2020

On Wednesday, people took to social media to share their thoughts.

One Twitter user, Mr Tee, alleged a "scam". Another user, Lungaz, suggested there was "absolutely no way in hell that's a coincidence".

Others called for an inquiry into Tuesday's winning lottery result and the competition's regulator, South Africa's National Lotteries Commission (NLC), said it would investigate the draw, which it called unprecedented.

A spokesman for NLC, Ndivhuho Mafela, said the body would review the incident and report its findings.