Charlie Hulson and Sara Treacy were among the winners at the Brooks Armagh International Road Races on Thursday evening.
An event record 67 men ran sub-15 minutes in the 5km event, while 28 women dipped under 10 minutes for the 3km race.
Hulson clocked 14:02.83 after a sprint finish to claim victory ahead of Belgium's Yannick Michiels with 14:02.99 and Andy Maud with 14:03.17.
Treacy ran 9:18.20 ahead of Sarah Inglis with 9:19.01 and Laura Whittle with 9:19.27.
In fourth was Rosie Clarke with 9:21.83, while Eilish McColgan, racing for the first time since November 2014 following injury, clocked 9:22.58 to finish just behind her.
You can read some of McColgan pre-comeback comments here.
"It's been a horrible 12 months but tonight I ran my first race!" McColgan tweeted after the event. "Can't stop smiling. Long way to go but it's progress!"