Police were called at 12:33pm on Tuesday, 6 July to reports of a woman behaving erratically inside a residential address at Herman Hill, South Woodford.
Officers from the Met Armed response were supported by officers working on counter-terror duties. Claims have been made that an operation had taken place at an NHS property that was terror-related. This is not the case.
A spokesman for the Met Police
Officers attended. The woman has been detained and will be taken to an east London police station.
Road closures and safety cordons were established as a precaution. These are expected to be lifted shortly.
No persons were injured.