Guests at a hotel in Perth where three people and a dog died in a fire had expressed concerns about faulty electrics and the use of fan heaters in rooms.
It comes as an investigation into the cause of the blaze at the New County Hotel continues following the deadly fire.
More than 60 firefighters were called to the scene shortly after 5am on Monday after the blaze broke out.
Guests were evacuated, as were two people staying in a neighbouring block of flats.
Three people died at the scene, and 11 were treated by medics but did not require hospital treatment.
Police Scotland and the Scottish Fire and Rescue Service have now launched a joint investigation into the incident.
STV News understands that guests at the hotel had raised concerns over electric items in the hotel.
In an interview with STV News, deputy First Minister John Swinney urged anyone staying at the hotel who had concerns to speak with police.
On Tuesday, officers remained at the hotel and cordons were in place around the area.
Tents which had been put in place by emergency services outside the hotel have been removed, and inside the building investigators wearing hard hats could be seen.
Blue plastic sheeting covered windows on the top floor of the building.
Tributes have poured in for those killed, led by Scotland’s First Minister Nicola Sturgeon.
In a post on Twitter, she described it as a “sad and shocking incident”.
She said: “My deepest condolences are with the bereaved and my thoughts with all those involved.
“I am also hugely grateful to the firefighters who responded and to our other emergency services.”
Jason Sharp, the fire service’s area commander, said it was a “very complex incident”.
Speaking near the scene in Perth on Monday, Mr Sharp said: “Our thoughts are very much with the immediate family and friends at this difficult time.
“Our firefighters worked extremely hard in a very complex and challenging environment to prevent the further spread of fire and damage where possible.”
STV News has contacted the New County Hotel for comment.