Police are searching for lost ammunition that accidentally fell out of a Queensland officer's handgun.

The traffic officer left Tank Street in Brisbane’s CBD on Friday on his motorbike and rode to Ipswich.

It was there he realised the magazine was missing — roughly four hours after he last saw it.

Camera Icon The lost magazine contains 14 rounds of ammunition Credit: 7 News

The magazine contains 14 rounds of ammunition, and Queensland Police are pleading for anyone who finds it to turn it in immediately.

It’s the second embarrassing gun-related incident for Queensland Police, with an unloaded handgun reported missing earlier this month.

The gun went missing from the Yamanto station on July 18 after an officer came back from holidays.

7 News understands that glock wasn't stored in the gun safe as it should have been.

An investigation is under way into both matters.