A man was threatened with a knife during a robbery as he paid for parking in Doncaster town centre.
The victim’s wallet was stolen during the incident in Market Place at 2.30pm on Saturday, November 28.
Police said the offender was a man in his 20s, who was white, 6ft tall and had dark hair.
He is believed to have been wearing a dark blue, anorak style coat with the hood up and dark trousers.
The following day a woman walking towards the payment station in the same car park was approached by a man who tried to take her purse.
After a brief struggle, the man left the car park with the purse but was chased by a passer-by.
The thief pointed a knife at his pursuer before dropping the purse.
He has been described as white, about 5ft 6ins tall, aged in his 30s, and slim.
He was wearing a dark raincoat with the hood up.
Both victims sustained minor injuries as a result of the incidents.
PC Jane Keightley said: “We believe these incidents to be linked given the location targeted and the short time period in which they happened.
“I would like to reassure members of the public that we are actively pursuing all lines of enquiry and we are committed to identifying those responsible for these crimes. I would ask anyone with any information to report it to us.
“Did you see anything suspicious in the area at the time of the incidents? Do you know who the men could be?”
Call South Yorkshire Police on 101