Over 4,500 kids and officials took part in the parade which took almost 35 minutes to arrive at its destination, such was the volume of participants.
The Mayor said she was excited to see a record number of teams attending the Foyle Cup, as well as seeing all the benefits that it brings to them.
She said: "Not only is the Hughes Insurance Foyle Cup good in terms of the fact that it is developing undoubted football skills in young players and encouraging kids to follow a healthy lifestyle, but in its own way it's very much contributing to building good relations as kids of all colours, creeds and religion happily parade together and play football together all week long."
The action resumed in the afternoon, with Brendan Rodgers' new side Celtic getting their campaign off to a winning start against Donegal Schoolboys in the Under-14 section.
Star player Karamoko Dembele, no relation to senior striker Moussa, was on top form for the Hoops, who secured a 1-0 win.
Owen Moffat scored the only goal of the game, an excellent free-kick in the 85th minute. However, the boys from Donegal will feel unlucky to have lost to their illustrious opponents given all the chances they had to snatch at least a draw.
Elsewhere, Strabane Athletic were held to a thrilling 1-1 draw by Cheshire side Altrincham FC in their Under-13s clash at Oakland Park.
Alex Johnson opened the scoring for the English team after a sublime lofted pass from Luke McMurray put him through on goal. However, Montel Atoge equalised in the second-half, powering home from Sean O'Donnell's cross.
Everton America Under-16s, who have made the long trip from New York to compete this week, were held to a 2-2 draw by Foyle Harps in their first game of the tournament, while fellow Americans Lansdowne Bhoys picked up their third draw in three games, after finishing 1-1 with Don Boscos in the Under-11 section.
For all the latest fixtures and results you can download the Foyle Cup app on your phone or you can visit www.foylecup.com online.
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