Aiken Promotions are once again warning customers not to buy tickets from any secondary sellers.

The fresh concerns come after some 60 people were turned away from the ZZ Top and Brian Wilson concerts in Dublin last week.

The concert promoters say the tickets were purchased on secondary sites and as a result, the disappointed fans were not able to gain access to the venues.

"Unfortunately it is NOT likely these people will get the money they paid refunded" said Peter Aiken.

"As a promoter, it is extremely frustrating to see people being exploited like this and I would like to emphasise once again that fans should not purchase tickets from any secondary sellers."