A MALFUNCTIONING swing bridge, which led to Hull 10k being cut short, wasn't working properly the day before the event.
Organisers were alerted just 30 minutes before the race, as more than 3,000 runners were delayed at the starting line of the Jane Tomlinson event on Sunday.
There was a 15-minute delay after those taking part were told the dock bridge near Hull Marina had stopped working.
Although the race went ahead, the route was cut to 9km, and some runners were left disappointed.
The bridge, near Wellington Street, is operated by British Waterways Marinas Ltd, with Hull City Council being responsible for repairs and maintenance.
A spokesman for British Waterways Marinas Ltd said: "I have been told there was a problem with the swing bridge on Saturday, which, despite best efforts, could not be fully fixed prior to the race.
"After discussions with the race marshals on Sunday morning, it was agreed to divert the race route.
"The bridge is the responsibility of Hull City Council but is operated on agreement by staff at Hull Marina.
"I understand Hull City Council are looking into the fault.
"We're very sorry that people were disappointed. It's fantastic that thousands of people turned out to support so many worthy causes and we'll be working with Hull City Council to make sure this doesn't happen again in future events."
Jane Tomlinson's widower, Mike Tomlinson, of event organiser For All Events, said they were not made aware of the problem until half an hour before the race and the issue was out of their hands.
They are now looking at options for next year and will soon be having talks with all parties involved, including British Waterways Marinas Ltd and Hull City Council.
Despite the grumbles from some runners about personal bests and the delay before the race, those who took part praised the organisers for coming up with a safe and quick alternative route.
Graham Hall, assistant head of service for transport and asset management, said: "We are reliant on staff at the marina to alert us if they are unable to rectify any fault.
"Regretfully, Hull City Council was not made aware of the fault on the day. When we were made aware on Monday morning, an engineer attended to look into why it was not working in time for Sunday's race.
"We, as a council, offer our support to the event organisers to ensure the event runs smoothly.
"This is a great annual event and attracts many people to Hull to see some fantastic sights and attractions as well as helping a worthy cause."
The bridge is operated by the British Waterways Marinas Ltd twice a day for high tide and to allow vessels pass.
Hull City Council has confirmed the bridge was fixed yesterday morning.
Organisers have not yet made a decision about the route for next year's Hull 10k. However, they have said those who took part in Sunday's event can enter next year's for a reduced fee of £10 instead of £28.