A man arrested on suspicion of murder after a fire at a historic former station house killed three people, including a four-year-old girl, has been released and will face no further action.
Police, fire and ambulance services were called at around 10.30pm to reports of a large fire at the address in Beswick Close, near Kettering.
A girl, 30-year-old woman and 23-year-old man died at the property in Rushton on Friday night.
The 54-year-old man, from Kettering, was arrested on Saturday but has been released and will face no further action, Northamptonshire Police said in an update issued on Sunday evening.
Senior investigating officer Detective Chief Inspector Ruby Burrow, of the East Midlands Special Operations Unit, said: "It is only right that an incident such as this is treated with the utmost seriousness, to make sure we have done all we can to understand what has happened for the sake of those who have died and their loved ones.
"In some cases, this requires arrests to be made in order to best secure potential evidence.
"Our team has been working at pace on this investigation and after rigorous examination of the available information, we do not believe there is any evidence of criminal wrongdoing at this point.
"As a result, the arrested man has been released without charge and will now be supported by specialist officers as he continues to assist the investigation team.

"The families involved have been kept updated on this development and I would repeat our request for their privacy to be respected at this incredibly distressing time."
One person was later taken to hospital by East Midlands Ambulance Service and three officers were assessed because of smoke inhalation.

The victims’ families have been informed and are being supported by trained officers.
Northamptonshire Police and Northamptonshire Fire and Rescue Service continue to appeal for information as they investigate the cause of the fire.
Specialist fire investigators and investigation dogs have been deployed to support the investigation into the cause of the blaze.
Images from the site show a large hole burned through the roof of the building, which is a 19th-century former station master’s house at the now-closed Glendon and Rushton railway station. It is a Grade II-listed building, according to the Historic England website, and is believed to now be a residential property.
Anyone with information is asked to call Northamptonshire Police on 101 quoting incident reference 25000180391.