The Pentagon has released its annual report on UFO sightings, or what it officially calls unidentified anomalous phenomena (UAPs) — and found 21 particularly curious incidents.

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.

More than 700 UFO reports were made in the last year, according to a report published Thursday by the Pentagon and the Director of National Intelligence report.