WATCH: Mourners line the streets of Clonmel ahead of McSweeney siblings' funeral

Mourners are lining the streets of Clonmel outside the church where the funeral mass of Grace and Luke McSweeney will take place. 

Members of the community and students of Presentation Secondary School are beginning to line up in the area outside St Peter and Paul's Church ahead of the mass at 11.30am. 

An altar with candles and several large bunches of flowers has been set up parallel to the church as mourners await the arrival of the siblings. 

Grace and Luke tragically died - along with Grace's two friends Zoey Coffey and Nicole Murphy - in a single vehicle collision on Mountain Road on Friday. 

The girls, all 18 years of age, had just received their Leaving Certificate examination results and were due to celebrate that night. 

Luke was driving the car when it overturned on the evening which claimed the four young lives. 

Following news of Grace McSweeney's death, Principal of Presentation Secondary School, Michael O’Loughlin, described her as "a gentle and kind person". 

He said, "She was thoughtful, considerate, and hard working. Grace was a gifted gymnast and dancer, and a very good student who had a positive impact on everyone she encountered." 

Video footage and photos: Faye Dorgan