Residents were evacuated and roads closed due to a “chemical incident” in south London on Sunday afternoon.
Fire, police and ambulance services were called to Lee after reports of a smell of an unknown chemical from a number of properties.
London Fire Brigade (LFB) said that seven adults were assessed on scene by the London Ambulance Service and two infants were removed as precaution.
Twelve residents were evacuated as a precautionary measure.
Ian Crouch, 39, told The Sun Online: “I could see the emergency services outside my house.
“When I spoke to a policeman he said there were people complaining of irritation, who had been throwing up all morning.”
Investigations are continuing into the incident.
It is not yet known what the chemical potentially involved it.
LFB said there was not currently any indication that the incident was terror-related.