Thieves who broke into allotments in an attempt to steal expensive equipment were foiled by upgraded security measures.
Rotovators and other pieces of machinery were removed from sheds at the site in Braunstone Town.
However, new locks on the perimeter gates could not be removed, so the thieves left the Braunstone Close allotments empty-handed.
Allotments steward George Raynor said: "We estimate seven sheds were broken into after the thieves climbed over the fence.
"The thieves took the doors off and looked at what they could steal.
"They removed a number of pieces of equipment, including rotovators. We don't think much has been taken but we are still trying to contact some of the allotment-holders."
He said members had spent more than £3,000 on new locks and chains, which had been fitted to the entry gates in January.
They had decided to step up security because of thefts from sheds last year.
There are more than 100 allotments being cultivated on the site, which is surrounded by fencing and houses.
Mr Raynor said it was the second time in two weeks that thieves had broken into city council-owned plots.
He said most of the sheds damaged in the latest incident had been repaired and the doors put back.
Allotment-holder Roy Snell, 68, had his shed attacked.
Mr Snell said: "They unscrewed the shed door and lifted the machine out and just left it outside.
"Nothing else has been stolen."
The break-in occurred overnight on Wednesday.
Police in Braunstone are urging anyone who saw anything suspicious in the area at the time to contact them on 101.