Two firearms, a flare gun and ammunition were found in a van which had just disembarked from the fast ferry on Sunday night.
Officials carrying out searches at the Deep Water Quay in Marsa stopped a van that had just arrived from Sicily, the Customs Department said in a statement.
The driver told the officials that he was carrying weapons.
During the search, customs officials seized a shot gun, an air gun, a flare gun and ammunition.
The weapons were given to the police.
The police are investigating the case.