On Sunday the front door of a house on Thorney Mill Road was set on fire while two adults and two children were inside the property.
Inside the house were a man aged in his fifties, a woman aged in her thirties, one boy and a girl who all suffered smoke inhalation and were taken to hospital for treatment.
They have all been discharged since.
READ MORE: 'Large amount' of money stolen from car with children in outside bakery
The police are now appealing for information after an incident of arson with intent to endanger life in Iver.
Investigating officer DC Gareth Wright of Amersham Police Station, said: “This is a concerning incident that occurred in the early hours of this morning.
“All of the victims suffered from smoke inhalation which required hospital treatment, but this incident could have been even more serious had they not managed to escape from the property.
ALSO READ: 15-year-old girl sexually assaulted in wooded area as police appeal for witnesses
“Understandably, this incident will have caused some concern in the local community, but I would like to reassure the public that we are conducting a thorough investigation.
“I would appeal to anybody who may have witnessed this incident to please get in touch with Thames Valley Police, either by reporting online or by calling 101, quoting reference number 43210342489.
“You can also call the independent charity Crimestoppers 100% anonymously on 0800 555 111.
“I would be particularly keen to hear from anybody who may have CCTV, dash-cam or doorbell footage from the area to please check this to see if it has captured anything that could assist this investigation.
“The incident occurred in the early hours, and so if your footage has captured anybody acting suspiciously in the area, please get in touch.”
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here