President Donald Trump has pledged to retaliate after two United States soldiers and an interpreter were killed in an ambush in Syria, an attack that has also drawn condemnation from Damascus. In other developments, Israel reports the killing of senior Hamas commander Raed Saad. Meanwhile, the opposition in Belarus is celebrating the release of political prisoners. Chile's presidential election features a contest between a communist candidate and a far-right rival. As the latest Avatar film prepares for release, the composer shares insights about creating its score.