Fire-Messages
Albus knew Marlene too well to waste any time asking for confirmation, because some times there was no way to find out for certain. There were too many possible targets, but only two needed immediate attention.
He sent the first fire-message to Severus:
This is a diversion. Return to Hogwarts, and protect the school. Send Regulus, Remus, Peter, and Neville on the Hogwarts express to keep an eye on the students.
The second message went to Gellert:
The attack on the Muggles is a diversion. Keep an eye on the Minister- and her family.
The final message went to Harry:
Hogwarts, the Hogwarts express and the Minister are protected