The World Health Organization believes the spread of radiation from a quake-crippled nuclear plant in Japan remains limited and appears to pose no immediate risk to health, the WHO’s China representative said on Friday.

“At this point, there is still no evidence that there’s been significant radiation spread beyond the immediate zone of the reactors themselves,” Michael O’Leary told a group of reporters.

“At the same time, we know that the situation is evolving and we need to monitor closely and see what happens over time. Things can obviously change, and have changed, over this last week.”