Greece ? Police cordoned off streets early today near the U.S. Embassy in Athens after an explosion inside the embassy compound that a senior police official said was an “act of terrorism.”

The blast smashed glass in the front of the building near the U.S. emblem of the embassy. Police did not report any injuries and embassy officials could not immediately be reached for comment.

“This is an act of terrorism. We don’t know where from,” Attica Police Chief Asimakis Golfis said. “There was a shell that exploded in the toilets of the building … It was fired from street level.”

Authorities were searching nearby apartment buildings and a hospital.