America's long-range bombers strike Iraq, Syria, killing 18 fighters. Here's what led to airstrikes

America has launched retaliatory airstrikes against Iran-linked militia in Iraq and Syria. At least 18 fighters have been killed after American forces hit over 85 targets with long-range bombers flying in from the U.S.

U.S. President Joe Biden has said that America's response will 'continue at times and places of our choosing'.