The tour group Otto Warmbier used to travel to North Korea will no longer allow Americans to participate in tours to the country, a decision the group said it came to after Warmbier’s death on Monday.

In an emailed statement to USA Today, Young Pioneer Tours said the risk assessment “for Americans visiting North Korea has become too high,” in light of Warmbier’s death.

“The devastating loss of Otto Warmbier’s life has led us to reconsider our position on accepting American tourists,” the group told the newspaper. “There had not been any previous detainment in North Korea that has ended with such tragic finality and we have been struggling to process the result.” Read more at The Hill.