WASHINGTON (AFP) - US President Donald Trump on Wednesday (June 7) expressed sympathy for the victims of a terror attack in Iran that killed 13 people, but issued a barbed warning that the country was reaping what it sowed.

"We grieve and pray for the innocent victims of the terrorist attacks in Iran, and for the Iranian people, who are going through such challenging times," Trump said in a brief statement.

"We underscore that states that sponsor terrorism risk falling victim to the evil they promote."