It took a CBS News crew more than 14 hours to drive south from Turkey to Tehran, a nearly 600-mile trip made longer by checkpoints and bad roads.

The fragile ceasefire between Israel and Iran appeared to be holding after a rocky start, giving rise to cautious hope that it could lead to a long-term peace agreement.

President Donald Trump compared the American airstrikes on Iranian nuclear facilities to the only use of atomic weapons in warfare during the 20th century.