Scores of City workers were forced to flee their offices this afternoon after a chemical incident was sparked by a gas leak from a fridge.
Two people were treated by paramedics as about 100 were evacuated from buildings near Liverpool Street station shortly before 3pm.
A 100m stretch of London Wall between Moorgate and Old Broad Street was cordoned off by police.
A spokeswoman for the London Fire Brigade said: "The chemical was ammonia leaking from fridge in an office on the third floor.
"Firefighters wearing breathing apparatus found elevated readings which have now returned to acceptable levels."
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Engineer Glenn Horton, whose H+H fire protection consultancy firm is just up the road from the evacuated offices, described the incident as it unfolded.
He said: "We can see at least four fire appliances, two ambulances and other vehicle.
"It's just between Finsbury Circus and Old Broad Street. All taped off."
He added: "I am a former fire officer and to me they seem fairly relaxed - no real panic."
Roads reopened after firefighters declared the area safe shortly after 4pm.
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