Two more people have been arrested after an arson attack on a mosque in Staffordshire.
The incident at the mosque in Regent Road, Hanley, on 3 December is being treated by police as a deliberate racist attack.
The two local men, aged 22 and 28, are due to be questioned by detectives from Staffordshire Police's major investigation department.
Two men and a woman remain on police bail while the investigation continues.
Ch Insp Wayne Jones, of Staffordshire Police, said: "These latest arrests are yet another important step in this complex investigation and are as a result of the mass of work already undertaken."
Officers were called to the mosque at 0630 GMT on 3 December after live CCTV footage showed smoke emerging from inside the building.
Police said a gas pipe had been fed from a nearby building through a window at the mosque.
Two men aged 18 and 19, and an 18-year-old woman, were arrested after the attack.
A 16-year-old male who was also arrested has been released and will face no further action.