The phrase "atrocity when" is not correct and does not convey a clear meaning in written English.
It may be intended to introduce a specific event or situation that is considered an atrocity, but it lacks context and clarity.
Example: "The world was shocked by the atrocity when the news broke about the massacre."
Alternatives: "horrific event when" or "tragedy that occurred when".
Northern Ireland suffers its worst ever terrorist atrocity when a 500lb car bomb explodes in the heart of Omagh, County Tyrone.
A tangle of rusty metal, on public display today for the first time, has dredged up memories of a British first world war atrocity, when the crew of an English vessel abandoned 16 German airmen to drown in the icy waters of the North Sea.
Although many who took part in the Provisional IRA's terror campaigns may be broadly in agreement with the Real IRA's aims to fight on, the Omagh atrocity, when 29 people and unborn twins died after a car bomb exploded in the centre on a busy Saturday afternoon in Co Tyrone town in October 1998, has resulted in many steering clear of the dissident organisation.
In 1655 comes a roar of rage in "On the Late Massacre in Piedmont", inspired by an atrocity when the Catholic Duke of Savoy sent his troops to slaughter a peaceful and ancient community of mountain Protestants who were minding their own business.
The Crown Office said it had approached the National Transitional Council (NTC) for help in its reopened investigation into the atrocity, when a bomb in the cargo hold brought down Pan Am Flight 103 over the town of Lockerbie in December 1988.
Some of the units took to committing atrocities when they thought the advisers were not looking.
But of course these things aren't atrocities when we do them.
In the trial's early stages, a witness accused him of taking part in the atrocities when he was an officer under General Ríos Montt.
The court was founded with the idea of legally tackling some of the world's worst atrocities when national governments prove unable to do so.
The court's mission is to prosecute perpetrators of atrocities when a country is unwilling or unable to prosecute them itself.
In the aftermath of the Paris atrocities, when attacks on Muslims have increased threefold, it has become all the more important.
