Tens of thousands of people are taking part in the annual Orange Order Twelfth of July parades across Northern Ireland.
Parades are taking place in 18 locations, with the largest in Belfast and Lurgan in Co Armagh.
Secretary of State for Northern Ireland Chris Heaton-Harris was one of the spectators at a parade in Co Armagh.
Mr Heaton-Harris has been strongly criticised by the order and unionist politicians in recent months for trying to pressure the DUP to go back into power-sharing.
However, he accepted an invitation to attend the event in Lurgan.
The Stormont Assembly remains collapsed amid DUP protest action over post-Brexit arrangements.
Many roads will be closed as members of more than 1,200 Orange lodges and accompanying bands take part in parades to celebrate the anniversary of the victory of King William of Orange in the Battle of the Boyne in 1690.
Around 250 bonfires were lit across Northern Ireland last night as part of traditional annual Eleventh night events preceding the parades.
An effigy of Sinn Féin deputy leader Michelle O'Neill was burned on one of them in Co Tyrone.
Arson attack 'could have killed me'
The home of a former Aontu election candidate in Newry in Co Down was targeted in an arson attack early this morning.
The PSNI is treating both incidents as hate crimes.
Aontú member Sharon Loughran, a paediatric nurse in Daisy Hill Hospital in Newry, said: "Just after 3am I awoke to the smell and sound of an inferno beside my house.
"My house is significantly damaged. I don't have electricity and can’t use the water.
"This was a horrendous action that very easily could have set my house on fire also. The arsonist that set this fire could have killed me.
"Aontú is only four years old. We have no history or baggage from the past at all.
"Indeed we have many Catholic and Protestant members. My house was also daubed with sectarian UDA graffiti during the local elections. But this is a radical escalation of that intimidation."
On Saturday night, a bonfire in Moygashel, Co Tyrone was lit with an Irish tricolour and a poster of Taoiseach Leo Varadkar on the top of it.
The towering pyre in Moygashel, themed as an anti-Northern Ireland Protocol bonfire, also had a boat placed on top of it.
While more people will parade and spectate in Belfast, the largest number of Orange Order members will march in Co Armagh, the birthplace of the organisation.
Organisers say 150 lodges will gather along with nearly 70 bands and thousands of spectators
