Kurt Hoyer said on Monday the embassy has asked for details "as soon as possible."
Emily Henochowicz, a 21-year-old from Maryland, lost her left eye after being hit in the face by a tear gas canister Israeli policeman fired during a demonstration last week in Jerusalem.
Israeli military spokesman Moshe Fintzy said the army was investigating the matter and regretted if anyone was harmed. He said soldiers faced a violent protest.
Rights groups accuse Israel of firing canisters directly at protesters. An American citizen was also badly wounded last year in a similar incident.
Meanwhile, the Israeli navy in diver suits off the coast of Gaza before dawn Monday, the Israeli military and Palestinian officials said.
The deadly incident comes a week after nine pro-Palestinian activists were killed in a clash with naval commandos as their vessel tried to reach Gaza. The interception prompted a worldwide outcry and growing demands that Israel ease or lift its blockade of Gaza.
Israel Seizes Another Ship
Israel Deports Flotilla Activists