Police are in attendance at a property in the Willows area of Lurgan following a report of a sudden death of a man this morning (Friday).
A 52-year-old woman has been arrested on suspicion of supplying a Class-C controlled drug and remains in custody at this time as enquiries continue.
Police have said a post mortem will be held in due course to establish the cause of death and there are no further details at this stage.
Upper Bann MP Carla Lockhart has urged motorists to seek alternative routes.
She said: “Police are continuing to have a strong presence in the area and it is likely to continue that way for the rest of the day. Best to avoid the area.
“Please allow time and space for the police to do their investigations.”