• The Islamic State for the first time claimed responsibility for a terror strike in Iran, saying its fighters carried out attacks on symbolic targets in Tehran that killed 12 people and wounded dozens of others.

Assailants with assault rifles, grenades and women’s disguises stormed Parliament and the tomb of Iran’s revolutionary founder. Here’s how the attacks unfolded.

Tensions in the Middle East were already high; after a visit to Saudi Arabia by President Trump, the Saudis and several Sunni allies led a regional effort to isolate Qatar, the only Persian Gulf country that has relations with Iran.