Cops mixed to Holloway Road in Islington after a suspicious bundle was found on a transport.
Highbury and Islington Station has additionally been closed, Transport for London affirmed.
Witnesses said suburbanites are escaping in frenzy.
Pictures show several suburbanites stranded as the occurrence happened soon after surge hour.
Hollway Road has been cut off because of a "police occurrence".
Cops were seen yelling "stand back" to all people on foot remaining in the zone.
London Overground tweeted: "No administration between Highbury and Islington and Dalston Junction because of a security alarm at Highbury and Islington."
The transport required in the occurrence is supposedly a 271 administration to Moorgate.
Metropolitan Police have subsequent to affirmed the clearing occurred because of a deserted bag on the transport.
Master officers analyzed it as a precautionary measure.
An announcement from the Met read: Police in Hackney were called to Holloway Road, Highbury and Islington at 08:39hrs on Wednesday, 11 May taking after reports of a thing of unattended gear installed a highway 271 Transport for London transport.
"Master officers went to.
"Cordons were set up as a safeguard whilst the thing was evaluated.
"It has subsequent to happened that the deserted bag was non-suspicious."
TfL affirmed Holloway Road has now been opened and cleared.