A man was stabbed in the chest during an attempted robbery in Milton Keynes in the early hours of Saturday morning.
Thames Valley Police said the victim was walking in an alleyway between Hatton and Colne in Tinkers Bridge at about 1.15am when he was approached by two men who demanded his mobile phone.
The 38-year-old man refused to hand over his phone and was then assaulted.
He suffered a stab wound to his chest and was taken to Milton Keynes General Hospital for treatment. His injury is not thought to be life-threatening.
Police are appealing for witnesses.
Thames Valley police is investigating the unexplained death of an 82-year old woman in Milton Keynes.
The woman's body was found in a house in the Latimer area of the town on Tuesday and police say the death is unexplained, but suspicious.
Officers are carrying out house to house enquiries in the area and say the death is an isolated incident.
A 48-year old man has been arrested on suspicion of murder and is in police custody.
Thames Valley Police are increasing the number of officers armed with stun guns.
The force says the move will improve policing in communities and allow it to respond more quickly without having to wait for armed units to arrive.
All police officers given Tasers will be fully trained.