DMLE Employees
Pretty well everyone would've been called, except Alice who is on maternity leave
The Ministry was notified about 3/4 of the way through the battle
By the time everyone got there, everyone involved had fled
They would've had to have finished putting out the fires, got all the civilians to St Mungo's (there would've been some healers on scene, but they would've had to do some immediate treatment as necessary), and started collecting bodies and figuring out the extent of the damages