Gdansk mayor Pawel Adamowicz has died from stab wounds a day after being attacked on stage at a charity event, Poland's health minister said.
A 14-year-old boy who was knocked off a moped and stabbed multiple times died in a targeted attack, police have said.
Police are urgently trying to arrest a male suspect after the women, aged 49 and 22, were killed in Solihull on Monday.
Police were called at 2.30am on Friday by paramedics to reports of an unresponsive woman inside a residential address in Brent.
Two suspects arrested late on Wednesday evening after an 18-year-old man became the latest victim of London's knife crime epidemic
More than 50 suspected murders in the capital so far this year, say police, after young man dies following knife attack in east London
Former police officer Norman Brennan spoke to Julia Hartley-Brewer about the recent spate of violent crimes
Officers gave an update after police found the bodies in near-simultaneous discoveries in Twickenham and East Sussex on March 5.
Lyndon Smith stabbed John Joyce to death in row over 'pool rules'
Police were called at approximately 10.30pm on Wednesday March 14 to reports of an assault on Padnell Road
The 26-year-old had stabbed the guard with a knife
Kelva Smith was discovered with several stab wounds on a street in South Norwood last week
Doherty launched completely unprovoked attack after a day of riding buses with his victim
The school boy has been handed an 18-month youth offenders institute sentence
Nicholas Foy was wearing only a pair of pink shorts when he attacked Volpe and subsequently had to be tasere4d
Three Palestinians have allegedly been killed in two days by the Israeli military
Stimpson stabbed McLaren to death in jealous rage after they worked out together at local gym
Marcel Hesse also killed a man who had confronted him about killing the boy
Molly McLaren was in a relationship with Joshua Stimpson for seven months before splitting up
Hatter launched into a 'frenzied' attack on dealer after throwing money at him
Jamal Jabbie's attacked was believed to be the result of a pyschotic episode which may have been exacerbated by cannabis
It is thought the incident was started by two pupils who were armed with knives
16-year-old youth found guilty of stabbing his former friend to death with a meat cleaver
Collins Adesoji and Bujwawne Brooks committed two stabbings in the space of an hour
Alex Vanderpuye was treated for a stab wound but died at 5.20pm
Four combatants sentenced to a total of 11 and a half years while a fifth, who attacked a police officer, will be sentenced next month
Lennox Appiah lay in wait for Rene Richardson before launching into stabbing frenzy
Woolven attacked his ex-partner when she went to pick up belongings from their flat
The National Prosecuting Authority says there is little chance the woman would be prosecuted, despite admitting to the stabbing
Isis has claimed responsibility for the Las Vegas shooting but an official motive has still not yet been established
Domestic violence charity ManKind says the case has sent the message that male victims aren't taken as seriously as female victims
Joshua Santos allegedly stabbed a nurse who had treated him weeks earlier
Grand Mufti of Jerusalem says 'we only accept that the situation returns to what it was before July 14'
Ralston Dodd was sentenced to nine years in prison for nearly stabbing someone to death
The man allegedly became angry during an argument at a birthday celebration in North Rhine-Westphalia, Germany
A police officer at Bishop International Airport was stabbed in the neck in what has been described as a terror attack, he is said to be in a stable condition
An Israeli Border Police commander was stabbed to death outside the Old City of Jerusalem, three Palestinian assailants were also shot dead
It is not yet clear what the motive was for the father to stab his children
A Russian boy was stabbed by an Afghan man at a refugee shelter in Arnschwang, his mother has been taken to hospital with serious injuries
A man stabbed a shop worker before being tackled to the ground by employees and arrested by police
The man was stabbed several times on his upper body, he died later in hospital due to his wounds
Police said a man stabbed a woman as it is believed that she accused him of sexual harassment which caused him to lose his job
Alin Apopei killed 25-year-old sex worker Denisa Silmen, after she said she was leaving him