Does "unaccounted for" mean "no way to be found" here?

Well, here "and all accounted for", also failed to get.
Does it mean "and all our employees have been accounted for and evacuated from the site"?

Context:

Here’s the full statement from Air Products the owners of the factory that was attacked:

We can confirm that an incident occurred at our facility in L’Isle-d’Abeau, France this morning.

Our priority at this stage is to take care of our employees, who have been evacuated from the site and all accounted for.

Emergency services are on site and have contained the situation. The site is secure. Our crisis and emergency response teams have been activated and are working closely with all relevant authorities.

Further information will be released as soon as it becomes available.

More:
http://www.theguardian.com/world/live/2015/jun/26/suspected-terror-attack-at-french-factory-live-updates

We know where each of them is. All are safe.

Hmm. Standard British English.
Thanks.

But it is still not clear to me about "unaccounted for" in the first post.

unaccounted for does not in any way MEAN that there is "no way to account for them/ no way to be found".

I have three cans of pop. (*The ones in my fridge I left unaccounted for.)

The scientists thought his medicine would never work, but there was something that was unaccounted for. The medicine was a cure for something else!

Cool.
But in the context below, the meaning is not clear to me.
According to your explanation, " 20,000 pieces of bodies" belong to (2,749 - 1,151) victims?

Bear in mind you are looking at a list, not a complete "narrative".



I imagine that for the 1,151 victims unaccounted for, they are missing presumed dead, and none of the 20,000 pieces of bodies found has DNA which matches theirs.
So they could not be identified from tissue samples.

But they were presumably known with some certainty to have been in the buildings prior to the collapse, and so can be described as "victims".

Excellent!