  The Extreme Universe Space Observatory on a Super Pressure Balloon
(EUSO-SPB1) is the second balloon pathfinder of the JEM-EUSO collaboration. It
is a nadir pointing UV telescope which aims at observing Ultra High Energy
Cosmic Rays (UHECR) air showers through their fluorescence emission. It was
launched the 24th of April, 2017, from the NASA balloon launch site in Wanaka,
New Zealand. During its flight, EUSO-SPB1 took data during 12 moonless nights
until the termination of the mission. In this paper we present events found in
triggered data while searching for air showers. We classify these events into
different populations whose characteristics and origins we discuss. We show
that the majority of our triggered events are direct Cosmic Ray hits on the
detector. No air shower candidate have been found in this analysis.
