An Internet rumor that hundreds of thousands of ethnic Korean residents are to be deported has seen immigration bureaus nationwide deluged with "tips" from bounty seekers and others about neighbors who in fact remain legal residents.

It has so overwhelmed local offices that the Justice Ministry has spoken out to deny claims that Zainichi ethnic Koreans with "special permanent resident" status are now subject to deportation. The group comprise mostly ethnic Koreans and their descendants.

It is unclear whether the rumor arose by mistake or was maliciously devised by racists and right-wingers, but it appears to have tapped a national thread of xenophobia, given the volume of callers trying to turn their neighbors in.