Police are investigating two overnight robberies.The first robbery was at Dominos Pizza on Goodall Parade, Mawson Lakes.

At about 9.30pm, two men wearing balaclavas and hooded tops and allegedly armed with knives, threatened a staff member and stole a small amount of cash.

They ran off and one is described as being of large build and wearing pale jeans.

If anyone saw the robbery, the men running from the store or if anyone has any information that may assist police, they are asked to call BankSA Crime Stoppers on 1800 333 000 or report online at www.sa.crimestoppers.com.au

Later in the night, in an unrelated incident, a man was standing in his driveway on Days Road, Ferryden Park when he was assaulted and robbed by two men, 16-19 years, wearing black hooded tops, baggy jeans and sneakers.

One was allegedly armed with a metal bar and hit the victim to the head.

The offenders stole the man’s wallet, mobile phone and keys.

The robbery happened just after 11pm and police ask if anyone saw the robbery or has any information that may assist police to call BankSA Crime Stoppers on 1800 333 000 or report online at www.sa.crimestoppers.com.au