Author's Note - This is a AU that assumes two things happened in Books 6 and 7.
Dumbledore did not curse himself with the rotting curse, and managed to survive past Harry's final year at Hogwarts when Draco failed to complete his mission.
Harry was killed by Voldemort, and Dumbledore managed to defeat him, and took a strictly advisory role in the Ministry as McGonagall took up his job as Head of Hogwarts.
12:00pm - DAY 1
This is the News. A short time ago, a unknown attacker razed Windsor Castle to the ground. Thankfully, the Royal Family were not in attendance, and the only known casualties were several tour guides and the people going on the tour.
The Queen is promising a full investigation, and casualty lists will be published in the news as and when they are available.
Dumbledore sighed. It had been a decade since the Prophecy had been fulfilled, and he was glancing at the Auror report on the attack in London.
"Some high-profile muggle's home." Minister Umbridge explained, with a sigh, "Fortunately, they were not there, so I highly doubt there will be much of a problem."
"Will you be meeting with the Muggle Prime Minister?" Dumbledore asked.
"I have some of my staff going to see him later to explain that we will handle it." Umbridge promised, "You can join them if you wish."
"That will be a great idea." Dumbledore explained.
DAY 7
This is the News. It is with a heavy heart that I report that Prime Minister John Major was killed when a terrorist bomb was smuggled into Number 10 Downing Street. Several members of his cabinet were also killed. There are several unidentified bodies, thought to be part of a group discussing the recent terror attacks on high profile targets.
In Malfoy Manor, Lucius Malfoy toasted with Dolores Umbridge as she smiled.
"He was a fool." Umbridge sighed, "Didn't even realize that he was carrying the instrument of his demise."
"The muggles will not know what hit them." Malfoy smirked, wondering what the sounds of rumbling engines were coming from above them.
Seconds later, Malfoy Manor was a crater, as the bombers reported signs of wreckage where there had been a empty field shortly before.
Up in Scotland, a group of special forces left the site of Hogwarts with several crowds of children in tow, shortly before the old castle was razed to the ground.
DAY 14
The interim Government are happy to report that the Royal Army and Air Force recently completed several missions to locate and eliminate the terrorist cells that attacked the Royal Family and UK Government in a attempt to cripple England as a country.
Several children were rescued from the terrorist cells, and are being treated in hospitals.
In other news, Magic exists! Several countries have discovered magical societies that were hiding since the Dark Ages, due to worry about another example of the Salem Witch Trials. Among them is good old Blighty itself, our own wizards...
Diagon Alley reopened several months after the shortest period of terror in the magical world to a diminished clientele. Not one of the major pureblood families had survived the purge, and some places were still closed.
Police officers patrolled the streets, the notice-me-not and muggle repelling charms removed. Gringotts now had a simple sign below it's name, 'Affiliated with the Bank Of England'.
It was a general concession now, for the magical people of England.
If you did like the old Magical Britain attempted, they'd raze what was left to the ground as well. Places like this only existed because it was too close to civilians.
No-one had any illusions that they had survived because they were better than anyone else.