Two people have been arrested on suspicion of manslaughter by gross negligence after a house fire led to the deaths of four children.
Riley Holt, eight, Keegan Unitt, six, Olly Unitt, three, and Tilly Rose Unitt, four, died after the blaze in Sycamore Lane, Highfields, Stafford, on Tuesday.
Staffordshire Police said a 24-year-old woman and a 28-year-old man were arrested at around 1.30pm on Friday.
They remain in custody, the force added.
In a statement, police said: "This incident has had a huge impact on the community and we understand there will be confusion and a demand for information.
"However, we would urge people not to speculate as to what may have happened and appeal for patience as the investigation continues.
"We will provide further updates as soon as we are able to."