Detectives from The Police Service of Northern Ireland’s Major Investigation Team are investigating the circumstances of the death of a two-year-old girl.
Detective Chief Inspector John Caldwell said: "The child was admitted to hospital yesterday afternoon (Friday, 6th August) after Northern Ireland Ambulance Service attended an address in Park Avenue in Dungannon. The child later died in hospital.
"As part of our investigation, we have arrested a 32-year-old man on suspicion of murder, and he remains in custody this morning.
"A post mortem will be conducted to establish the cause of the child's death.
"Our thoughts are with the child’s family, which is being supported by Family Liaison Officers.
"We will update you in due course but, at this time, there are no further details."