Iranian Supreme Leader Ayatollah Mojtaba Khamenei promised on Saturday that Iran will strike back for the deaths of his father, Ayatollah Ali Khamenei, and all other Iranians killed during the war with the U.S. and Israel.

The former Supreme Leader’s funeral took place over the course of six days, with millions of mourners gathering to grieve their leader’s death. People were seen holding banners saying “Kill Trump” in English, as the U.S. and Iran exchanged the most fire since the ceasefire went into effect in April. Mojtaba Khamenei released a written statement vowing revenge on behalf of his father, having not been seen in public since he was wounded in an airstrike at the beginning of the war.