The World Tonight

Dr Sanjoy Kumar’s daughter Grace was one of three people killed in the 2023 Nottingham stabbings. He tells Shaun Ley that the authorities have different questions to answer after the murder of Henry Nowak in Southampton last year.
Also in the programme: Canadian astronaut Chris Hadfield responds to news that crew on the International Space Station (ISS) were ordered to shelter in an attached spacecraft after the structure sprung a leak. And a new exhibition celebrates 50 years of the Undercroft Skate Space below London’s Southbank Centre.

Speaking on BBC Question Time, Greater Manchester Mayor Andy Burnham says he would join any challenge for the Labour leadership. He would need to win the Makerfield by-election later this month in order to launch an official leadership bid.
The Conservative leader Kemi Badenoch has told the BBC that conflict over identity politics could eventually lead to a civil war in the UK. We look at whether identity politics has contributed to a fracturing of British society.
Also in the programme:
Are elected Republicans becoming more comfortable challenging President Trump's decisions?
And how did the altar stone of Stonehenge make it from Scotland to Salisbury? Researchers think they finally have the answer.

The warning from the US Secretary of State comes as Ukraine strikes St Petersburg. We hear how the news is going down in Washington DC.
Also in the programme: after 18-year-old student Henry Nowak was handcuffed and arrested as he lay dying, we hear how police officers are trained. And Barack Obama’s presidential library in Chicago opens its doors to the public in a couple of weeks’ time, but is it any good?

Prime Minister Keir Starmer is among those saying there are questions for the police to answer after the release of harrowing bodycam footage of Henry Nowak's final moments.

There have been clashes between protestors and police in Southampton near the scene where the student was stabbed by a Sikh man who falsely claimed he had been racially abused. We ask whether anti-racism guidance may have obscured the truth.

Also on the programme: a partial truce between Israel and Lebanon seems to be holding - we have a report from northern Israel and hear from both the Lebanese government and Hezbollah. And the government announces thousands more black men will take part in a trial for prostate cancer screening.

Long-awaited documents published by the government have revealed messages between Lord Mandelson and ministers strongly criticising the prime minister, No 10 and Labour MPs. We hear reaction from Labour MP Kim Johnson.
Also in the programme: a new proposal could see abusive air passengers placed on a national blacklist and prevented from flying. And on what would have been her 100th birthday, we reflect on how Marilyn Monroe’s legacy has evolved over the years.