Two more young men have died as a result of knife attacks in London, taking the total number of fatal stabbings involving teenagers this year to 18.
Scotland Yard said two murder investigations have been launched following the separate incidents, which both happened in the past week.
One of the teenagers was stabbed in an "apparently pre-planned" attack by the suspects who fled the scene in Northolt, north west London on Saturday using scooters.
The second attack happened on Thursday at around 11.15pm. Officers were called to Mount Pleasant Road in Walthamstow, north east London, to reports of a group of men armed with weapons.
An 18-year-old man with a stab wound to his stomach was found by officers at the scene - he was taken to an east London hospital for treatment, but died on Monday.
The latest stabbings follow a spate of knife attacks in the capital this year, which has seen a total of 18 victims aged 19 and under suffer fatal stab wounds.