The investigating officer said that unlicensed .38 handgun ammunition was found in Oscar Pistorius' house.
It was previously reported that an unlicensed handgun had been found, but this is not the case.
The officer called for Pistorius to face addition charges for possessing the ammunition, and not a gun.
More top news
UKIP have made further gains in the local elections in the Anglia region and the Conservatives have won back control in Peterborough.
Labour have held Sunderland, Newcastle, Hartlepool and South Tyneside - but UKIP and the Lib Dems make some gains
Labour suffered losses in English council elections, but the initial results were not as bad as many had expected.