Two teenagers have been stabbed to death in London.
In the first attack, a 19-year-old man was killed at a petrol station in Wealdstone, north-west London, at 1930 GMT on Thursday.
Three hours later, an 18-year-old man was found with stab wounds opposite Maryland railway station in Stratford, east London. He died in hospital.
The latest stabbings bring the number of teenagers killed in violent attacks in London this year to three.
Gang theory
Police have not made any arrests or released the names of the victims of Thursday's attacks.
In the incident at the High Weald Service Station in Wealdstone, another 19-year-old suffered stab wounds to his torso.
He is said to be in hospital in a stable condition.
Detectives believe the victim of the Stratford attack could have been targeted as part of gang-related violence.
Last month, 15-year-old Stephen Lewis was stabbed to death in Plaistow, east London, following a row at a party.
On Wednesday three boys aged between 16 and 17 were stabbed in a suspected gang fight on Kings Road, Chingford, east London.