Devon and Cornwall Police have confirmed a woman resident at the property in Eastborne Road in St Austell has been arrested and is currently receiving treatment in hospital.
The property houses people with special needs and Cornwall Council is rehousing the displaced residents.
More top news
Hold on to your hats, tents & caravans!
1970s children's television classic "Trumpton" will be set alight in a huge bonfire next month
An Avon & Somerset Police officer has told ITV News staff are 'scared to death' at the prospect of the Chief Constable returning to work.