Orangemen in Co Armagh have vowed not to be defeated by the "hate mongers" who continue to target them.
Two Orange halls in the Tandragee area sustained smoke damage after arson attacks on New Year's Day.
The latest incidents at the Ballylisk and Tandragee district halls follow a year which saw 27 halls across Ireland targeted by arsonists.
The Orange Order says there now have been 288 attacks on lodge premises since 1971.
Co Armagh has borne the brunt of recent incidents with seven halls in and around the Portadown, Craigavon and Tandragee area set on fire in the last three months.
Ulster Unionist leader Sir Reg Empey said the North could be engulfed in a wave of tit-for-tat fire bombings if attacks against Orange halls continue.
GAA or Hibernian Order premises could be targeted in retaliation. "Anyone who cannot see that there is a sectarian campaign running to destroy Orange halls is not living in the real world," said Sir Reg.
Senior Orange Order figures joined local lodge members at the Tandragee District Hall, the site of the most severe of yesterday's fire. Grand Secretary of the order Drew Nelson said anger was growing within the organisation that the attacks seemed to be escalating.
"People are very unhappy in this section of the Protestant community the political temperature is rising," he said.
Mr Nelson said he was in no doubt the same people were responsible for carrying out the recent attacks in Co Armagh and called for legislation to make it easier for Orange lodges to gain damage compensation.
District Master of the Tandragee District, Kyle Ellison said the attacks were a deliberate attempt to create community tension in the area.
"It is with sadness and regret rather than anger that members of Tandragee Orange district discovered their hall had been attacked by fire bombers," he said.
"I would call on the general public to help us defeat the hate mongers by making the Twelfth in Tandragee this year the best Twelfth ever in Co Armagh."
Police have appealed for anyone with information about the arson attacks to contact them.
The Ballylisk fire was started with fire-lighters in the hallway of the premises. It failed to take hold and only minor smoke damage was caused. A number of windows were also smashed in the incident.
At the Scarvagh Road hall in Tandragee police are investigating reports that a door was forced open and a fire started in the hall.