Face of Nation : Emergency services were called to Livingstone Road in Bowes Park, north London, at 12:15 BST following reports of an incident.
Those found injured have been taken to hospital. Their condition is not yet known.
Officers have said the attacker was known to the victims.
No-one else is being sought in connection to this stabbing.
Livingstone Road has been closed at the junction with Bowes Road A406, and a cordon is in place while enquiries are carried out. Motorists are advised to avoid the area.
