The 52-year-old was arrested after a Metropolitan Police-led raid in Shrublands Avenue yesterday at 1.30pm.

A bomb squad were deployed to the scene after the grenade was found, but the incident is not believed to be terror-related.

The road was closed off during the raid, where a number of other firearms were also found.

A spokesman for the Metropolitan Police said: "On Tuesday, August 13, officers from the Metropolitan Police Service executed an arrest enquiry for firearms offences at a residential address in Shrublands Avenue, Warley.

"Specialist officers also attended after what was believed to be a grenade was located in the house.

"A number of other firearms weapons were seized.

"A 52-year-old man was arrested at the scene and taken into custody.

"He has since been released under investigation pending further enquiries.

"This is not being treated as terror-related."