Two men have been arrested in connection with a number of arson attacks across Armagh, Banbridge and Craigavon.
One of the men, aged 31, is being questioned about two robberies and four arson attacks, while the second, aged 26, has been detained in connection with 12 arsons.
Some of the offences date back to October 2015.
Searches were conducted in Princess Way, Loughgall Road and West Street in Portadown, and Greenpark Drive, Markethill.
Computer equipment, phones and cash have been seized by police.