Japan is planning for a possible mass evacuation of the nearly 60,000 Japanese citizens currently living in or visiting South Korea in the wake of North Korea’s latest nuclear weapons test.

“There is a possibility of further provocations,” Japanese Prime Minister Shinzo Abe warned Monday at a meeting with lawmakers, the Nikkei Asian Review reported.

“We need to remain extremely vigilant and do everything we can to ensure the safety of our people.”

There are roughly 38,000 long-term Japanese people living in South Korea, as well as another 19,000 or so tourists and other travelers.

“If the US decided on a military strike against the North, the Japanese government would start moving toward an evacuation on its own accord regardless of whether the American plans are public,” a Japanese government source told the website.

Tokyo is developing a four-part emergency plan that includes discouraging travel to South Korea, urging Japanese citizens there to evacuate, and urging them to shelter in place if hostilities break out.

Japan would need to coordinate with South Korea under a shelter-in-place scenario.

If Pyongyang launched a military attack that led to the closure of South Korean airports, the Japanese embassy would urge citizens still in the country to stay at home or move to a safer place in the South.