The first-ever Japan-North Korea summit, slated for next Tuesday in Pyongyang, has left Japanese police wondering what role they will play in the security arrangements, police sources said Friday.

The National Police Agency, which provides security for Prime Minister Junichiro Koizumi, sent a 10-member advance team to North Korea last Saturday to make arrangements with authorities there, but progress appears to have been limited.

"We don't know much about our counterparts in North Korea. Security arrangements are still a blank slate," one member of the delegation said before leaving North Korea for home Tuesday.