Over 700 new cases were just found in the Pentagon’s UFO report, 21 of which the agency says it can’t explain.

The report consisted of hundreds of new cases of misidentified balloons, birds, and satellites, including some that cannot be explained in easier terms, such as a close call between a commercial airliner and an unidentified object near the New York coast.

The Pentagon has received hundreds of reports of new UFO sightings, including “several particularly interesting cases,” according to the director of the office that investigates these reports, but reiterated it found no evidence of alien activity.