The front door of the HSBC branch in Żebbuġ was mysteriously found ajar yesterday evening, but nothing went missing from the bank.
The bank is located right in the heart of Żebbuġ square, which is full of bars and band clubs.
The door was noticed by a bank customer who went to use the cash machine around 5pm.
But bank officials and the police who went to the scene noticed that the main door as well as the glass door inside the branch had not been forced in and the alarm failed to sound.
Police will be looking at CCTV footage to investigate the mystery. Until this morning, there were still no developments.