Mungo Park Road was closed for a period of time just after 2 pm this afternoon following an incident that saw armed police arrive in Havering.
Locals reported seeing three men and a woman arrested by armed officers following reports of a man with a firearm.
A Met police spokesperson told the Havering Daily: “Police were called at 14:30 on Monday, 29 June to Mungo Park Road, Rainham to reports of a man with a firearm.
“Officers attended, including armed officers, and three men and a woman (no further details) were arrested on suspicion of possession of a firearm.
“No injuries were reported. Enquiries are ongoing and traffic is being diverted in the area. A crime scene is in place and police remain on scene.”