A bomb exploded at a branch of Spanish banking giant BBVA in Buenos Aires, destroying an ATM but causing no injuries, police said.
The bombing at the BBVA-Banco Frances on Wednesday, which shattered the bank branch's windows, is the second this month against Spanish banks in Argentina.
No one has, however, claimed responsibility for the attack, police said.
A bomb had exploded in the early part of August outside a branch of Santander Rio in the capital, causing damage to the structure.
The attack was allegedly carried out by a group calling itself the Andrea Salsedo Revolutionary Brigade Cells, which has claimed responsibility for similar bombings.
The group claimed it carried out the bombing in July of a BBVA-Banco Frances branch that destroyed an ATM and wounded a woman.