Around 250 bonfires were set alight in loyalist areas last night.
The Northern Ireland Fire Service attended 35 bonfire related incidents last night.
Meanwhile police are investigating reports of flags and emblems being placed on some bonfires.
Around 250 bonfires were set alight in loyalist areas last night to mark the start of the Battle of the Boyne commemorations.
It is usually one of the busiest nights of the year for the Northern Ireland Fire Service.
File image: Rolling news, Bonfire in Larne.
Last night fire crews responded to 98 operational incidents during that time, over one third of those were bonfire-related incidents.
Meanwhile the Police Service of Northern Ireland (PSNI) said that it had received "a number of complaints relating to flags, effigies, election posters and other emblems being placed on bonfires".
Later, members of the Orange Order will hold marches at 18 locations across Northern Ireland.
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