ABC News May 20, 2015

Fall of Ramadi: 30 Car Bombs, 10 as Big as Oklahoma City Blast, US Official Says

WATCH: Fleeing the Fighting in Ramadi, Iraq

The State Department is sharing new details about the deadly fighting in Ramadi, Iraq, last Sunday, saying the city fell into ISIS hands after the militant group set off 30 suicide car bombs in the city center, 10 of which each were comparable in power to the Oklahoma City truck bomb of 1995.

The explosions took out “entire city blocks,” said a senior State Department official who spoke to reporters at the State Department Wednesday on condition that he not be named. The vehicle-borne improvised explosive devices, or VBIEDs, were able to gain access to the city center after an armored bulldozer plowed through T-wall barricades lining the city's critical government buildings, the official said, adding that the same bulldozer was later used as a power VBIED, itself.

Soon after the bombs went off, the Iraqis deployed a reinforcing column into the city center, but they were forced to retreat after coming under heavy enemy fire, the official said. That retreat led to a larger exodus of Iraqi security forces and the civilian populations, leaving the streets looking “barren,” according to this official.

Why the Latest ISIS Battlefield Victory Matters 'Terrible Day,' as Iraq Says City of Ramadi Falls to ISIS

The State Department and the Pentagon insist the fall of Ramadi does not closely resemble that of Mosul in 2014, when, after only a week of fighting, Islamic State forces were able to take over the entire city as ISF forces abandoned the posts, equipment and even their uniforms.

The State Department official argued that Ramadi has been fiercely contested for 18 months, as both sides controlled equal parts of the city. It wasn’t until the critical government center fell this weekend that ISIS was able to lay claim to the entire provincial capital.

But the official admitted that, in this case, the Iraqi forces did leave some U.S.-made weapons behind. The official suggested that if the enemy attempts to commandeer any of the bigger weapons, they would be killed in airstrikes.

“I’m told that when we see Daesh [another word for ISIS or ISIL] trying to get ahold of that equipment, we’ll take care of that problem,” the State Department official said.

The official also argued that, unlike what happened in Mosul, the Iraqi forces have not collapsed. Rather, they have “regrouped” and “consolidated” and remain mostly intact while they make plans for a counter-offensive, the official said.