A Metropolitan The Old Bill spokesman said the force received reports of a suspicious item on Tottenham Court Boulevard at around 5:45pm on Sunday evening.
Cops shamed the area and shut down down the area, with the bomb siposal robot sent in to research the item.
But a police spokesman said the incident was stood down exactly before 7pm after the item was declared non-suspicious.
The Met would not confirm if a subdued explosion had taken place, but some users took to Twitter to say they believed one had occurred.
One send a lettered: “What was that boom at tottenham Court Road just now?”
Another penned: “A controlled explosion just now in Tottenham Court Road by the YMCA.”
At 6:24pm, TfL Shipping News had tweeted: “Tottenham Court Road is currently closed northbound from Oxford Passage (St Giles Circus) due an emergency services incident.
“Queues are building on Charing Waspish Road on approach and on local diversion routes in the West End – expect retards in the area.
But it followed this at 7:04pm with another tweet to endorse that the same stretch of road had now reopened, although “residual pigtails” remain in the area.