A search eventually turned up a severed foot and scattered remains, but authorities had trouble determining how the hikers had died. The dog came back, but the young women didn't. On April 1, 2014, two students from the Netherlands named Lisanne Froon and Kris Kremers went on a hike in Panama with a dog. 'The Lost Girls, The Bones, and the Man in the Panama Morgue'. 'Deep Inside the Panama 'Paradise' Murder Mysteries'. 'Indígenas han sido pieza clave en investigaciones'.
'The Lost Girls of Panama: The Full Story'. ^ 'Cronología de la búsqueda de Kris y Lisanne'.'Death on the Serpent River: How the Lost Girls of Panama Disappeared'.
Archived from the original on 29 June 2017.
Froon's bones still had some skin attached to them, but Kremers' bones appeared to have been bleached. DNA testing confirmed they belonged to Froon and Kremers. Soon at least 33 widely scattered bones were discovered along the same river bank. Two months later, closer to where the backpack was discovered, a pelvis and a boot with a foot inside were found. Kremers' denim shorts, zipped and neatly folded, were found atop a rock on the opposite bank of the tributary a few kilometers away from where Froon's backpack had been discovered (although later witnesses would claim the jeans were not neatly folded but found in the river itself ). The discovery of the backpack led to new searches along the Culebra. On April 11, the phone was turned on at 10:51, and was turned off for the last time at 11:56. One report showed that between 7 and 10 April, there were 77 emergency call attempts with the iPhone.
After April 6, multiple attempts of a false PIN code were entered into the iPhone it never received the correct code again. Kremers's iPhone would not make any more calls either but was intermittently turned on to search for reception. After April 5, Froon's phone battery became exhausted after 05:00 and was not used again. None of the calls had gone through due to a lack of reception in the area except for one 911 call attempt on April 3 that lasted for a little over a second before breaking up. The first distress call had been made just hours after beginning their hike: one from Kremers' iPhone at 16:39 and, shortly after that, one from Froon's Samsung Galaxy at 16:51.