The bomb used by the Saudi-led coalition in a devastating attack on a school bus in Yemen...
...was sold as part of a US State Department-sanctioned arms deal with Saudi Arabia, says CNN.
The weapon that left dozens of children dead was a 500-pound laser guided MK 82 bomb.
It was made by Lockheed Martin, one of the top US defense contractors.
The bomb is very similar to the one used in an attack on a funeral hall in Yemen in October 2016.
That bomb killed 155 people and hundreds more were wounded.