Iran's Nuclear Facility Activity Analysis

This image, one of several shared exclusively with CNN,

may show signs of Iran attempting to rebuild its nuclear facilities.

This is one of

several locations across the country where we've identified recent activity,

both in nuclear and missile sites.

The activity in nuclear sites in particular raises questions as to whether Iran

violated the Memorandum of Understanding it signed with the US in late June,

even before President Trump seemed to signal its end by launching fresh strikes.

In it, Tehran had agreed not to procure or develop nuclear weapons. This site in

Parchin is believed to be holding explosive material for nuclear weapons.

Before the US Israeli strikes,

Iran built this concrete shield around it, a sign of its importance.

It was then struck multiple times during the US Israel bombing campaign this year.

The targeting was precise.

You could see the holes left behind by bunker busting bombs.

Now, in new imagery from June and July,

analysed by CNN in conjunction with the Institute for Science and

International Security,

we can see Iran appeared to be taking steps to repair and reconstruct the site.

You can see temporary covers placed over the impact holes.

Then weeks later,

with the memorandum still in effect,

the covers are removed and replaced with a mesh.

Concrete mixing trucks are visible nearby.

Experts say these trucks are a sign the Iranians are intending to seal the holes.

For weeks, we've only had glimpses of what's been happening on the ground inside

Iran. Providers have been withholding satellite imagery across the region at the

request of the US government.

Now those restrictions are loosening and

we've been able to see new images across Iran of which sites they've started to

clear and repair first.

A sign, perhaps,

of which they see as the most important.

This is Pickax Mountain,

another site where Iran is believed to be advancing its nuclear capabilities

deep underground.

And in recent weeks,

vehicles could clearly be seen going in and out of the tunnels.

Experts told CNN this was likely a violation of the terms signed with the US,

which required Iran to maintain the status quo regarding their nuclear programme.

In contrast, other prominent nuclear sites did not seem to have been touched,

like Isfahan here, Fordow here and the tents.

There has been activity at some missile sites.

The US and its allies have long been concerned about Tehran's missile capacity,

and the latest imagery suggests Iran has already started

repairing some storage sites.

This is new paving laid out at

Tabriz missile base in recent days.

And at another missile base in Kermanshah,

we can see excavators and tunnel entrances being cleared.

Lastly, we've also spotted repairs at air bases in recent days.

You can see a crater being filled in here at Tabriz air base.

With the US resuming its attacks on Iran, a peace agreement is seeming

increasingly out of reach. Katie Pogles, CNN, London.