They 'likely' saved some lives. (?)

How are you?

I'm a S. Korean eager to learn English.
I chanced to listen to a speech made by President Obama about a mass shooting in Oregon few weeks ago.

https://www.youtube.com/watch?v=cLCusJEvPuM

This is a line of his speech.

I want to thank all the first responders whose bravery likely saved some lives today.

What's puzzling to me is 'likely'.

Without 'likely' there, the sentence wouldn't be easier for me to understand.

'They saved some lives.'
Okay, this means they succeeded saving in some people.
Can't be simpler. No doubt about it.

Then, what about 'They likely saved some lives.' ?

The first idiom that springs up to my mind upon hearing 'likely' is
'be likely to', which I've tried to memorize.
But that, unfortunately, doesn't help me here.

I looked up some dictionaries,
and 'likely' seems to have several meanings.

1. probably or apparently destined (usu. fol. by an infinitive): something not likely to happen.
2. seeming like truth, fact, or certainty; believable: a likely story.
3. seeming to fulfill requirements or expectations; apparently suitable: a likely place to live.
4. showing promise of achievement or excellence.
5. probably: We will most likely stay home this evening.

Well, the pattern 'likely + verb' is No.5, which defines 'likely' as 'probably'.
Then, when the president made that speech, he wasn't quite sure
whether some people were saved, but he only guessed 'probably' some citizens were rescued by the first responders?

What could the president possibly have intended to say when he added 'likely'?