The victims ranged in age from one to about 14 years old, said Shreveport, Louisiana police spokesperson Chris Bordelon. A total of 10 people were shot.
The U.S. and Iran have a long history of tensions, including a CIA-led campaign to topple Iran's prime minister in 1953 and the taking of American hostages in 1979.
The move comes after President Trump again threatened to invoke the Insurrection Act to control ongoing protests over the immigration enforcement surge in Minneapolis.
A new portrait of President Trump is on display at the National Portrait Gallery's "America's Presidents" exhibition. Text accompanying the portrait removes references to Trump's impeachments.