The U.S. government has received more than 700 reports of unexplained phenomena but have found no proof of extraterrestrial life, the Pentagon’s UFO office confirmed at a Thursday briefing.

The Pentagon released a report that concluded there is no verifiable evidence of extraterrestrial beings among nearly 300 cases of “unidentified anomalous phenomena,” more commonly known as UFOs.

The review includes hundreds of cases of misidentified balloons, birds and satellites as well as some that defy easy explanation, such as a near-miss between a commercial airliner and a mysterious object off the coast of New York.