A loudspeaker broadcast in provincial Turkey caused outrage after the sounds of a pornographic video reportedly flooded through a densely-populated neighbourhood.

The x-rated audio was blasted from a municipal speaker system in the Kuzykent neighbourhood in Kastamonu province, Hurriyet reported.

An video purporting to show the incident was posted to YouTube and shows residents laughing as loud sexual moans fill the night air.

On Facebook, the province's mayor Tahsin Babaş called the broadcast "dirty provocations" and said "the legal process should be taken as soon as possible for those who want to do this immoral act".

"We apologise to our precious fellow townsmen for this situation," he added.

According to Hurriyet, local security officials believe the municipal frequency was hijacked.

"We think that they intercepted the municipality frequency because it occurred in only one region. It would have occurred everywhere if it was the municipality’s central announcement system," they told the site.