Israel's bunker-buster bombs from U.S. may be defective

Israel is seeking clarifications from the United States to ensure that bunker buster bombs it recently purchased are not carrying defective fuses that could cause their premature detonation.
The laser-guided bomb, GBU-28, weighs about 5,000 pounds and is reportedly capable of penetrating 100 feet of dirt or alternatively 20 feet of concrete. The bomb was initially developed in the 1990s to penetrate hardened Iraqi command centers located underground.