Saudi Arabia last week halted flights from seven southern African countries
The strain, which was first announced by South Africa but has since been discovered to have been present earlier in Europe, has prompted governments around the globe to reimpose travel restrictions, despite warnings from the World Health Organisation this could do more harm than good.
"One case of the Omicron variant has been detected in the kingdom — it was a citizen coming from a North African country," the ministry official told the state SPA news agency.
The kingdom had been lifting some of the remaining restrictions it imposed early in the pandemic .
"He has been put in isolation, as have his contacts, and the necessary health measures have been taken."
Saudi Arabia last week halted flights from seven southern African countries, mirroring similar moves by other government, but travel links with North Africa have remained unaffected.
The kingdom had been lifting some of the remaining restrictions it imposed early in the pandemic, allowing worshippers at the Muslim holy places to resume praying shoulder to shoulder from October.
Since the pandemic started, Saudi Arabia has recorded 549,000 cases of Covid-19, 8,836 of them fatal.
More than 47 million doses of Covid vaccine have been administered in the kingdom, which has a population of nearly 35 million.
Some activities will remain banned, including weddings and corporate meetings. Social gatherings will continue to be limited to a maximum of 20 people, SPA said, citing an interior ministry source.
The Hajj, which begins on Wednesday, normally draws around 2.5 million people for five intense days of worship in one of the world's largest gatherings of people from around the world.
"Holding the ritual in the shadow of this pandemic... required reducing the numbers of pilgrims, but it obliged various official agencies to put in double efforts," 84-year-old King Salman said in a speech.
The media said that the lioness was fleeing from its owner in a street in Mosul, running amok in broad daylight among the vehicles.
Since the conflict began on Friday, 31 Palestinians — including six children — have been killed, while 275 people have been wounded, said health authorities.
Speaking during a visit to Bangladesh, Chinese Foreign Minister Wang Yi said his country's actions were "legitimate, reasonable, in accordance with the law," and aimed at protecting China's "sacred sovereignty."