US drops 'mother of all bombs' on Islamic State tunnel

U.S. forces in Afghanistan on Thursday struck an Islamic State tunnel complex in eastern Afghanistan with "the mother of all bombs," the largest non-nuclear weapon ever used in combat by the U.S. military, Pentagon officials said.

The bomb, known officially as a GBU-43B, or massive ordnance air blast weapon, unleashes 11 tons of explosives. When it was developed in the early 2000s, the Pentagon did a formal review of legal justification for its combat use.

The Pentagon said it had no early estimate of deaths or damage caused by its attack, which President Donald Trump called a "very, very successful mission."