Three people were taken to hospital following an arson attack in a block of flats in Craigavon on Sunday.
Detectives are appealing for information and witnesses following the incident, which happened just before 11pm.
A Police Service spokesperson said: “Officers received and responded to a report of a fire at a block of flats in the Aldervale area shortly before 10.50pm.
“Colleagues from the Northern Ireland Fire and Rescue Service were already in attendance at the scene, and in the process of evacuating residents.
“A number of people were offered temporary accommodation for the evening, three of whom also attended hospital for treatment for smoke inhalation.
“At this time it is believed that the fire was started deliberately in the ground floor hallway. Enquiries to establish the extent of the damage caused as a result are underway.
“We’re extremely grateful for the quick actions of our officers, and for the swift response from the Fire Service in bringing the situation under control.
“Officers remain at the scene this morning, conducting enquiries, and an investigation to establish the circumstances of this reckless incident, which we are treating as arson with intent to endanger life, is underway.
“I’m appealing to anyone who was in the area yesterday evening and may have noticed any suspicious activity, or who may have any information which could assist us, to get in touch.
“The number to call is 101, quoting reference number 1906 of 10/09/23.”
Alternatively, you can submit a report online using the non-emergency reporting form via http://www.psni.police.uk/makeareport. You can also contact Crimestoppers anonymously on 0800 555 111 or online at http://crimestoppers-uk.org
Councillor Jude Mallon has condemned the arson attack.
The Sinn Féin representative said: “It is only by sheer luck that we are not talking about fatalities as a result of this attack on people’s homes.
“As it is a number of residents required hospital treatment and others are out of their homes forced to sleep in a local community centre. I want to thank the emergency services, Council and Housing Executive officials who came to the aid of residents.
“I would appeal to anyone who has information about this attack to contact the police immediately.”