Iran fired missiles on Sunday into eastern Syria, aiming at the bases of terrorist groups it holds responsible for attacks in Tehran which left 18 dead last week.
Iranian Revolutionary Guards launched the mid-range ground-to-ground missiles from western Iran into the Deir al Zour region of eastern Syria, killing a "large number" of terrorists and destroying their equipment and weapons.
The missiles targeted the "headquarters and gathering centers of Takfiri terrorists supporting and building car bombs".
The attack last week, which included shootings and at least one suicide bombing, was on Iran's parliament and the shrine of Ayatollah Ruhollah Khomeini, the founder of the Islamic Republic.
"The spilling of any pure blood will not go unanswered," the Revolutionary Guards said in the statement.