On 25 April it was eight years since Ahmadreza Djalali, Swedish citizen and doctor of disaster medicine at Karolinska Institutet, was arrested while on a visit to Iran. Karolinska Institutet’s president, Annika Östman Wernerson, and vice-president, Martin Bergö, have written an open letter to Sweden’s minister for foreign affairs and minister for education, calling on them to use all means available to increase the pressure on Iran to free Dr Djalali and other Swedish citizens.