US President Barack Obama left Washington Saturday for the G20 summit that begins this weekend in Turkey and is now expected to focus on the fight against terror following the Paris attacks.

The leaders of the world's top 20 industrialized nations were set to deal with an already packed agenda before the killing of at least 129 people in Paris. The White House said earlier in the day that Obama would convene his National Security Council to review intelligence before leaving for the two-day summit in Antalya.