Two further males have been arrested over a house fire in Bentilee.
Officers were called to a property on Beverley Drive, at about 10.55pm on Thursday (16 December).
A 31-year-old woman and a 13-year-old girl remain in critical but stable condition in hospital following the fire.
A 19-year-old man, from the Oldham area, and a 17-year-old male from the Stoke-on-Trent area, were arrested on suspicion of attempted murder on 23 December.
A 18-year-old man, from the Stoke-on-Trent area, was also arrested on suspicion of attempted murder at Manchester airport on 20 December.
An 28-year-old man, from the Stoke-on-Trent area, was arrested on suspicion of wounding with intent on 18 December, while on the same day, two other men aged 21 and 22, also both from Stoke-on-Trent, were arrested on suspicion of attempted murder.
All those arrested remain on conditional police bail while inquiries continue.
Anyone with any information or relevant CCTV or dashcam footage should message Staffordshire Police on Facebook or Twitter, quoting incident 804 of 16 December, or call 101.
Alternatively, contact Crimestoppers anonymously on 0800 555 111.