seems to be a Reuters photo with this caption:
"AVIANO, Italy (Reuters) - A protestor throws a rock at riot police outside the Aviano Air base in northern Italy Sunday. More than 300 protestors took part in the demonstration against NATO's air strikes on Yugoslavia. Photo by Stefano Rellandini"
(found at http://home.hiwaay.net/~craigg/g4c/NATO-help.htm)