Detectives investigating a series of recent incidents in the Ards and North Down area have made two further arrests.
A 50-year-old man was arrested in Belfast under the Terrorism Act following a search at a residential property in Newtownards.
A 30-year-old man was arrested in Newtownards on suspicion of a range of offences, including arson with intent to endanger life.
Both men were taken to Musgrave station for interview.
Three men previously arrested remain in custody at this time.