Up to 150 members of the Saudi royal family are infected with coronavirus, it has been reported.

King Salman and Mohammed bin Salman have both gone into isolation to avoid the outbreak, reports added.

Doctors at the elite King Faisal Specialist Hospital in Riyadh that treats members of the royal family are preparing 500 more beds for an expected influx of patients.

The operators of the facility said: 'Directives are to be ready for VIPs from around the country'.

King Salman (pictured) and Mohammed bin Salman have both gone into isolation to avoid the coronavirus outbreak, it has been reported

This was written in a 'high alert' sent out electronically on Tuesday to senior doctors and later obtained by the Times.

The message said they don't know how many cases they will get but that all chronic patients are to be moved out as soon as possible and only top urgent cases will be accepted.

Any infected staff members will now be treated at a less elite hospital to save room for royals.

Salman, 84, has secluded himself on an island palace near Jeddah, while the crown prince has moved to a remote site on the Red Sea coast.

Salman, 84, has secluded himself on an island palace near Jeddah, while the crown prince (pictured) has moved to a remote site on the Red Sea coast

Doctors at the elite King Faisal Specialist Hospital that treats members of the royal family are preparing 500 more beds for an expected influx of patients. Pictured: two women wearing masks in Qatif

The number of Saudi princes is in the thousands and many travel frequently to Europe where it has been suggested they picked up the virus before bringing it home. The Saudi royal family is estimated to have about 15,000 members.

Saudi Prince Faisal bin Bandar bin Abdulaziz Al Saud - the governor of the capital Riyadh who is in his 70s - is in intensive care after contracting the virus, according to The New York Times.

The country of about 33 million people has reported 2,932 cases and 41 deaths.

So far, mostly members of lower branches of the royal family have been infected, a source told the Times.

Saudi Arabia is expecting up to 200,000 coronavirus cases within weeks, the country's health minister said on Tuesday.

'Within the next few weeks, studies predict the number of infections will range from a minimum of 10,000 to a maximum of 200,000,' said minister Tawfiq al-Rabiah, according to state media.

Rabiah, who warned the kingdom faces a 'critical moment' in the fight against the virus, said the projection was based on four studies by Saudi and international experts.

Some Saudi cities including the capital Riyadh are under a 24-hour curfew imposed by the interior minister.

Some Saudi cities including the capital Riyadh are under a 24-hour curfew imposed by the interior minister. Pictured: an empty King Fahad main street in the Saudi capital Riyadh

Tabuk, Dammam, Dhahran and Hofuf are also under lockdown, as well as the regions of Jeddah, Taif, Qatif and Khobar.

The Gulf port of Dammam is a major entry point for supplies for the country's oil industry.

The holy cities of Mecca and Medina have also been sealed off, throwing this year's hajj pilgrimage into doubt.

Authorities last week urged Muslims to temporarily defer preparations for the annual pilgrimage, but have yet to say whether the hajj will go ahead.

As in many Middle East countries, Saudi Arabia's first case was a patient who had recently travelled to Iran, which was one of the early hotspots in the pandemic.