Iran, which initially dismissed allegations that a missile had brought down the plane, acknowledged only on Saturday that its Revolutionary Guard had shot down the plane.

By Nasser Karimi, Aya Batrawy, Associated Press

Iran's security forces deployed in large numbers across the capital on Sunday, expecting more protests after its Revolutionary Guard admitted to accidentally shooting down a passenger plane at a time of soaring tensions with the United States.

By Joseph Krauss, Jon Gambrell, Associated Press

Iran's Revolutionary Guard on Saturday acknowledged that it accidentally shot down the Ukrainian jetliner that crashed earlier this week, killing all 176 people aboard, after the government had repeatedly denied Western accusations and mounting evidence that it was responsible.

By Nasser Karimi, Joseph Krauss, Associated Press