US, Australia, Canada, Japan, South Korea and New Zealand among countries urging citizens to avoid travel to Kingdom.

Several countries have warned their citizens against travel to Saudi Arabia following a series of Houthi attacks on airports in the kingdom.

On Monday, Australia and New Zealand became the latest to issue advisories against travelling to the kingdom, following similar warnings from the United States, Canada, the UK, South Korea, and Japan.

Australia’s Department of Foreign Affairs and Trade said Australians should avoid King Khalid International Airport in Riyadh and “reconsider” travel to other Saudi airports.

New Zealand’s Ministry of Foreign Affairs and Trade urged citizens not to travel to the Saudi capital’s main gateway and the provinces of Najran, Jazan and Asir for any reason, and to avoid “non-essential” travel to Saudi Arabia as a whole.

The US embassy in Riyadh on Sunday advised US citizens to reconsider travel to the kingdom, citing the threat of attacks by Iran and the Iranian-backed Houthis.

Global Affairs Canada issued an advisory against non-essential travel to any part of Saudi Arabia.

South Korea’s Ministry of Foreign Affairs recommended that its citizens in Saudi Arabia leave unless they are on essential business and advised anyone planning to travel to the kingdom to cancel their trip.

The UK’s Foreign, Commonwealth and Development Office urged citizens to avoid travel to Jeddah and Dammam, and to all airports apart from Medina International Airport, except for essential reasons.

The warnings come as Saudi Arabia reels from five attacks on its airports in less than a week.

One person was killed and 11 others were injured on Sunday when a projectile struck King Khalid International Airport, according to Saudi Arabia’s General Authority of Civil Aviation (GACA).

A Houthi strike on the same airport on Saturday killed 13 people and injured more than 300 others, marking the deadliest attack on Saudi Arabia in more than a decade.

The Houthis claimed responsibility for all four strikes on Saudi airports before Sunday’s attack, which has yet to be claimed by any group.

King Khalid international airport and King Fahd international airport in Dammam remain closed following the attacks, causing significant disruption to aviation across the Middle East.

The attacks have also disrupted flights to and from King Abdulaziz International Airport in Jeddah.

More than 150 flights were cancelled and 374 flights were delayed at the Jeddah airport on Sunday, according to the flight tracking website Flightradar24.

Brendan Sobie, an independent analyst and consultant in Singapore, said it was too early to predict the ramifications of the attacks for aviation across the region and beyond.

“As has been the case with the Iran war and the impact from that crisis on the UAE, Kuwait and Bahrain, the impact of this latest crisis really depends on how long it lasts, how long Riyadh airport remains closed, and how long and to what extent are the restrictions once it reopens,” Sobie told Al Jazeera.