Emergency services rushed to the incident in Naples.
The explosion occurred at around 3am in via Enrico Pessina in the ground floor of the Le Shabby Cafe.
The doors were completely ruined in the blast.
A car was also damaged.
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The area was cordoned off as cops searched for the culprits.
They managed to track down the bar owners.
The brothers said they had never received any threats or attempts at extortion.
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There were no reported injuries.
The popular cafe is located near to Dante Square, one of the city's busiest underground stations.
Police are looking at CCTV from the scene.