Aliens? Beings? What are they?

One day
Today
They were
Here
There
Everywhere

Yesterday
They weren't
They came
Within a night

And this night
Tonight
They are gone

One
The other
They are
No longer
Here
There
Everywhere

Because
They were
Taken
Tortured
And bruised

They were saved
By the people
Of this world
The people
Who orgiginally
Hated
Betrayed them

Now everything
Is back
To normal

Until
Maybe
They come
Again

???