Books information are welcome.
There is none...there is no source novel for the non-flashback parts of The Godfather: Part II so we only have the script to go on.
A detachment of military move quickly, accompanied by some
of Roth's men, as though they have important news that must
be dealt with.
Of course there is news, The Cuban revolution has just begun (as evidenced by the news reaching the Presidential Palace where Michael is).
The entire reception has been disrupted for an announcement;
all the guests in their formal dress and evening gowns,
standing with frightened faces like first class passengers
on a doomed ship. The President himself, his back to our
VIEW, is making an announcement in Spanish. While he
speaks, we notice continuous movement of his personal staff,
carrying suitcases and possessions.
...Because of serious setbacks of
our troops in Guantanamo and
Santiago, we feel reluctantly, that
we must leave the Capital at once.
Myself and my family must bid you
goodbye, and good fortune. We will
go directly to Ciudad Trujillo.
Clearly the military (not police) are on their way to inform the highly influential Hyman Roth and ensure his escape from Cuba...even from his sick bed.