Formal diplomatic relations between Sweden and Iran were established in 1929 when a treaty of friendship was signed between the two countries.
[1] On 24 August 1981, a group of thirty-three Iranian exile students stormed into and occupied the embassy in protest of extrajudicial executions and violence in Iran.
Earlier during the summer, under the rule of Mohammad-Ali Rajai, about 700 extrajudicial executions had been carried out in Iran.
[citation needed] Later the same day, Swedish police forces stormed the building to release the then ambassador of Iran to Sweden, Abdel Rahmin Gahavi, his wife, and a servant who had been taken hostage.
The protestors were arrested and taken to the Kronoberg Remand Prison in Stockholm, where twenty-nine of them were later detained in custody pending trial.