The block was built in the 1960s and is situated on Weston Street. Armed Police could be seen entering the complex.
Six armed officers with MP5 (Glock) weapon could be seen at the front door. A man was later removed in handcuffs and taken away in a Police van. The man remains in custody.
The full details of the nature of the incident have yet to be released.
The Met Police have been approached for comment