Authorities have launched an investigation after a small border city says it was ripped off by scammers posing as concert bookers for the Mexican rock band Mana.

San Luis officials said the city was swindled out of $50,000 in 2012 when it wired money to what they thought was a concert-booking agency in Mexico, the Yuma Sun reported.

The money was to pay for the Grammy-award-winning Mana to play at the city's Barrier 2 Bridge conference.

But Mana never showed up.

The supposed booking agency failed to respond to repeated phone calls and emails from the city seeking a refund.

The San Luis City Council has voted to write off the money as lost funds.