A care worker was left terrified after three people ran out of a house and told her to hand over her possessions or they would stab her in the face.
The incident happened as the 27-year-old woman was walking home along Euston Street, Preston.
Police say she had caught a bus from the Brockholes Brow area to Fishergate after finishing work and was walking home via Bow Lane, Good Street and the alleyway heading into Euston Street.
As she walked past a property on Euston Street, three people, one of them believed to be a woman, came out.
She ignored them but the three ran up behind her and one of them blocked her path.
She was then told: “Give me your phone, wallet and money,” with the assailant adding: “Don’t mess around or I will stab you in the face.”
The terrified woman handed over her possessions, including a £200 phone, before the three people ran off.
She rang police from a neighbour’s home.
Detectives investigating the case believe the crime was a spur of the moment offence, but asked anyone with information to contact them.
Det Sgt John Crichton, of Preston CID, said: “It seems like it was opportunistic. She has been walking along with her earphones in.
“She did not see a knife but was left fearing for her life.”
The main attacker is believed to be a woman, aged between 16 and 22, and around 5ft 2in and 5ft 3in in height.
She was wearing dark black coloured clothing and her head was covered apart from her eyes.
The second attacker was a man around 5ft 9in tall who had also covered his face.
The third attacker was also a man, who was around 5ft 6in tall.
Call police on 101 with any information.