A predawn bid to watch the sunrise from Germany’s tallest peak may be turning into a criminal case. The BBC reports that authorities are investigating a 21-year-old German man on suspicion of endangering public safety after his 17-year-old girlfriend was found stranded on the Zugspitze in near single-digit temperatures. The girl called emergency services at around 8,200 feet above sea level and was airlifted off the mountain in hypothermia, then treated and released from a hospital in Garmisch-Partenkirchen.

Mirror. However, they reportedly hit deep snow and abandoned plans to reach the 9,718-foot summit. At some point the two separated and the man descended alone; police haven’t yet detailed why, citing the ongoing probe, per the BBC. It’s reported, however, that the girl had lost her strength, the Independent reports. Once the investigation wraps, a report will go to prosecutors in Innsbruck, who will decide whether to bring charges, per the BBC.