Two people were injured during a middle of the night robbery outside their home.
Two offenders pounced on the 50-year-old man and 35-year-old woman in Mullion Place, Fishermead at 1am on Saturday.
One of the robbers pushed the woman to the ground and punched her in her face, while the other knocked the man down and assaulted him.
They stole an HCT mobile phone before fleeing.
Both offenders were in their late teens. One was white and wearing a red hoodie and red baseball cap while the other was black wearing a black hoodie.
Witnesses should call 101.