Obama says nuclear Iran a "grave threat"

SDEROT, Israel (Reuters) - U.S. Democratic presidential candidate Barack Obama said on Wednesday a nuclear Iran would pose a "grave threat" and that the world must stop Tehran from obtaining an atomic weapon.

"A nuclear Iran would pose a grave threat and the world must prevent Iran from obtaining a nuclear weapon," Obama told reporters after visiting the Israeli town of Sderot, which lies close to the border with the Hamas-run Gaza Strip.