The source of a mystery humming sound which has plagued people living in Omagh may now have been identified – but is not being made public.

People in the County Tyrone town first started to report a persistent humming that was keeping them them awake in the second half of last year.

A Fermanagh and Omagh District Council investigation has now ended.

John Boyle, the council’s director of community and wellbeing, said it had been “complex” but had been able to “hone in on a specific spot”.

Mr Boyle said the noise “wasn’t audible every night", and was linked to atmospheric conditions, making the investigation very difficult.

“We were able to hone in on a specific spot, and undertook a targeted screening exercise with a number of industrial businesses using equipment on a 24-hour basis," he said.

“However, a particular premises became the focus, and environmental health officers engaged with the management.

“While nothing was absolutely concluded, the noise did cease in a sense, but we will keep the complaint open and under review over the next number of months."

He told the council’s regeneration and community committee the council had received a total of 11 hum complaints.