Police are appealing for information and witnesses following a reported stabbing in St Albans on Monday 9 October.
Man arrested arrested on suspicion of GBH after males found with stab wounds and taken to hospital. A third person, a 17-year-old boy, also presented at hospital with a hand injury.
On Saturday, forensic officers were present at the scene of the incident in north-west London, and a significant police presence could be observed in the area. Granville Road was completely cordoned off, and investigators were conducting inquiries near a primary school adjacent to an apartment block.