Police in Brent are appealing for witnesses and information following the stabbing of a 17-year-old in Wembley.
Six males aged between 16 and 18 have been arrested on suspicion of affray, officers said, and they are currently in custody at a north London police station.
Police, paramedics and air ambulance crews rushed to Wembley High Road at 3.30pm yesterday afternoon and found the teenage boy with a stab wound.
He was taken to a central London hospital where he remains in a stable condition.
His injuries are not believed to be life-threatening.
Detectives from Brent Borough CID are appealing for anyone who witnessed the incident to come forward.
Any witnesses, or anyone with any information, are urged to contact Brent CID via 101, or by tweeting @MetCC.
People can call Crimestoppers anonymously on 0800 555 111 or visit crimestoppers-uk.org.