Preliminary tests on samples from two wild crows found dead in Kyoto Prefecture, where bird flu has broken out, have tested positive for the virus, prefectural officials said Sunday.

Samples of the crows were to undergo further testing by the National Institute of Animal Health in Tsukuba, Ibaraki Prefecture.

Should additional tests show that it is a highly contagious strain of the virus, it would be the first time for it to be found in wild birds in Japan.