U.N. experts have begun analyzing satellite imagery of the Syrian site struck last month by Israeli warplanes, looking for any signs it was a secret nuclear facility, diplomats said Friday.

It was unclear where the material was obtained or what exactly it showed. One of the diplomats, who is linked to the International Atomic Energy Agency, said the experts were studying commercial images, contrary to earlier suggestions they came from U.S. intelligence.

Separately, a senior diplomat familiar with the issue indicated the experts were looking at several possible locations for the Israeli strike. Two other diplomats said initial examination of the material found no evidence the target was a nuclear installation, but emphasized it was too early to draw definitive conclusions.