A swathe of the London Bridge area has been evacuated as police investigate a security alert.
The bus station and part of the rail station was cleared of passengers after officers were called to a security alert in London Bridge street on Tuesday afternoon.
The road bridge was also closed to traffic.
Photos posted on social media show police guarding a cordon at the scene.
Witnesses described seeing a swarm of emergency services vehicles descending on the area.
A woman, who was evacuated from a nearby gym, told the Standard: “The bus station just outside is closed – someone mentioned a suspicious vehicle but that was a bystander rather than a police officer.
“Looks like some of the office buildings may have been evacuated. The rail station is apparently open if you access via the escalator under the Shard.
“There are lots of police vehicles and at least two fire engines are onsite.”
Journalist Anila Dhami tweeted: “#LondonBridge station evacuated. Loads of security services including police and fire. Large area cordoned off with more police arriving.”
Platforms 10 to 15 of the rail station and the Tube was not affected by the incident.
A Met Police spokesman said: “We were called to a security alert in London Bridge street at 1.40pm. The bus station and part of the rail station has been evacuated as a precaution.
“The incident is ongoing.”
British Transport Police wrote on Twitter: “Specialist officers from BTP are assisting @metpoliceuk investigate a security alert at London Bridge. Station is currently closed.”