UNITED NATIONS (AP) — Cuba so far hasn't unearthed any information about who or what caused a mysterious series of health incidents that have affected U.S. and Canadian diplomats in Havana, its top diplomat said Friday.

Foreign Minister Bruno Rodriguez Parrilla told the U.N. General Assembly that early results from its investigation have to date "found no evidence whatsoever that could confirm the causes or the origin" of the problems, though the inquiry is continuing.

"It would be unfortunate if a matter of this nature is politicized," Rodriguez added in a speech that also laid into U.S. Pres...