Key questions!!
Isn't that a 'rumour'?
I think it is more than a word of mouth rumour from local residents but ,yes I do not think it has been officially announced .But unlike rumours given by people who know some one on the estate ,this is found in a report that anyone can read.
There are always inaccuracies printed by the press so unless it is an official police statement or word of mouth interview ,we have to take many things we read as not actually true.As routine procedure the police will conduct a search of Tia's bedroom in her family home.