Police patrols have been stepped up following two robberies in a Sheffield park in which mobile phones were stolen.
Both were committed in Hillsborough Park, with a 13-year-old boy the latest victim.
He was walking through the park at 3.25pm on Wednesday, March 29 when he was approached by a man who started talking to him.
The boy was then threatened by the man, who stole his phone..
On Tuesday, March 12, South Yorkshire Police said a 'young man' was pushed to the ground as he walked through the park. His phone was also stolen.
Descriptions of the offenders have not yet been released.
A South Yorkshire Police spokeswoman said: "Both of these incidents remain under investigation and high visibility patrols have and continue to be conducted in the area."
Anyone with information should call South Yorkshire Police on 101.