Many front pages carry pictures of the 17-year-old gunman who murdered 15 people, many of them at a school, near the German city of Stuttgart.
The Daily Telegraph says detectives are investigating whether Tim Kretschmer targeted girls after being snubbed by female classmates.
The Daily Mirror describes how one of his victims - a teacher - died confronting him as she shielded pupils.
He was "a weirdo, obsessed with death metal music and guns", one girl said.
Further controversy has followed the row over the protests by Muslim activists at a parade of soldiers returning from Iraq.
The Daily Mail accuses "firebrand" preacher Anjem Choudary of taunting the families of men killed in Afghanistan.
He is quoted as saying troops were "not heroes, but closer to cowards who cannot fight, as their uncanny knack for death by friendly fire illustrates".
The Daily Express calls his comments "vile" and "sickening".
The Amazon rainforest - home to the world's greatest concentration of biodiversity - is doomed, according to the Guardian.
It quotes Met Office researchers as saying rising temperatures could kill nearly half the forest by the end of the century.
The Express says Buckingham Palace has come top of a list of London's most environmentally unfriendly buildings.
Five government buildings were on the list, drawn up using thermal imaging.
The Guardian says security forces on both sides of the Irish border are looking for a dissident republican bomb, smuggled into Northern Ireland.
Intelligence reports are said to suggest that the Real IRA brought in a large device from the Republic.
Meanwhile, scientists say they know why we like unhealthy, salty food - it puts people in a better mood, while creating similar cravings to drug addiction.
The Telegraph sums up the story by saying: "Pass the peanuts".