US investigators are trying to find out why a 63-year-old computer consultant detonated a bomb that killed himself and injured three others in Nashville.
Baarayaasha Mareykanka waxay isku dayayaan inay ogaadaan sababta uu 63 jir la taliye xagga kombiyuutarka ah u qarxiyay bam uu isku dilay isla markaana uu ku dhaawacay saddex kale magaalada Nashville.