Britain's Jessica Varley won the women's title at the Laser Run World Championships in Dublin, Ireland.
Varley would hold off home favourite Kate Coleman Lenehan in the competition, which took place at Trinity College.
She completed the event in a winning time of 12min 6.40sec.
Lenehan was forced to settle for the silver medal after ending in a time of 12:19.50, while the Czech Republic's Barbora Ciprova rounded off the top three in 12:20.40.
Ireland were also denied home victory in the men's competition with Hungary's Bence Kardos taking the victory in 10:01.11.
He ended nearly one minute clear of Tom O'Brien, with the Irish competitor securing the silver medal.
Bronze was claimed by the Czech Republic’s David Kindl, who clocked 11.01.80.
Age group events were also held at the International Modern Pentathlon Union (UIPM) event.
"Laser run is one of the very important non-Olympic pillars of our union, and we will support it more and more," said Klaus Schormann, UIPM President.
"You can also see that it is receiving a lot of support from National Federations.
"Many different countries won medals today and it's very important that the medallists are coming from different continents, especially Europe and Africa.
"The technical organisation here in Dublin has been very professionally set up, with fair conditions for everybody, and we are looking forward to another wonderful day tomorrow."
A charity team relay event will take place tomorrow.
The laser-run was created by the UIPM in 2015 as a fast-paced spin-off of the main Olympic event, mirroring the last two of the five designated disciplines.
The event is designed to be easy to stage and has featured participants across a broad age range.
Laser-run involves four rounds of laser pistol shooting from a 10 metres distance, incorporated into four 800m runs.
Athletes have to hit the target five times before they can set off on the run.