Six appliances were needed to put out a fire at Palace Barracks in Holywood, County Down.
West Belfast man Fred Scappaticci, 72, has been named as the agent inside the IRA codenamed Stakeknife.
The 33-year-old went missing in the second week of January 2018.
Secretary of State Karen Bradley tells the NI Affairs Committee her “priority” is to get devolved government “up and running”.
Another budget may be necessary according to the most senior civil servant in the Northern Ireland Office