A man in his 30s is in a life-threatening condition after being stabbed in south London.
Police were called to Lavender Hill, Battersea, at around 0330 BST on Friday.
They found the man with three stab wounds to his torso and another in the arm.
Police have closed off the area around Queenstown Road while forensics teams examine the scene.
In a separate incident, a man in his 20s was attacked with a broken bottle in Croydon, south London, leaving him with three puncture wounds to his back.
He is in a serious but not life-threatening condition in a local hospital.
The assault happened on London Road at about 0220 BST.
Another man was arrested at the scene on suspicion of causing grievous bodily harm.
He is also in hospital with minor injuries to his hand.