The victim of each incident had their bicycle stolen.
At around 5pm a 22-year-old man from Warrington was accosted by three males that came from the opposite direction as he cycled on a path that runs alongside Nansen Close.
One of them was riding a bicycle and the other two were walking.
One of them threatened the victim and demanded his white Carrera Kraken mountain bike.
After stealing the bike the offenders fled in the direction of Old Hall and Westbrook.
The victim left the scene in the direction that he came from, towards the railway above the path.
Around an hour-and-a-half later, at approximately 6.30pm, a 14-year-old boy was walking with his bicycle and a 13-year-old girl along the ‘sand path’ near to Sankey Valley Park towards Lilford Avenue.
When they were near to the low and high bridges above they were accosted by two males who had come from the park.
One was on a bicycle and the other was walking.
The 14-year-old victim, who is from Warrington, was threatened by one of the males.
He then grabbed the victim’s dark blue Carrera Hellcat mountain bike off him before the offenders rode off towards the park.
Cheshire Constabulary believes that the incidents may be linked.
Enquiries are ongoing and detectives are appealing for anyone who was in the area and believes they may have seen something that could be relevant to their investigations to come forward.
They are particularly keen to speak to anyone who was cycling in the Sankey Valley Park area whilst wearing a helmet camera, as well as to anyone who thinks they may know the identities of any of the offenders.
Detective Sergeant Darren Reid, of Warrington CID, said: “These incidents have understandably left the victims extremely shaken up and I would like to reassure the community that we are stepping up patrols in the area.
“Anyone with any concerns should speak to an officer.
“I would also like to reassure Warrington residents that we are determined to find out who the offenders are and make them face the consequences of their actions.
“We believe that the incidents may be linked and as part of our investigations we want to hear from anyone who was in the Sankey Valley Park area and thinks they may have seen the offenders before, during or after either of the robberies.
“The same goes for anyone who may have footage of the offenders from a cycling helmet camera.”
The three offenders in the first robbery are described as white and looked to be in their late teens.
The male on the bike was around 5’ 9” tall, of proportionate build and was wearing a dark coloured cotton-style hooded top with the hood pulled up over his head. He had a black zip-up jacket over the top of his hoody and also had dark cotton jogging bottoms on.
The male who threatened the victim looked between 5’ 10” and 6’ tall. He had a slim build and was wearing a black hoody with the hood pulled up. He had a neck warmer underneath this, which was pulled up and covered the lower half of his face. He also had black jogging bottoms and dark coloured Nike-style trainers on and was carrying a drawstring bag over his back.
The other male who was on foot was also wearing dark clothing including a hooded top with the hood up.
The two offenders in the second robbery were also white.
The male on the bike had blond hair and is described as wearing a hooded top with the hood up and grey jogging bottoms.
The male on foot had dark hair and is described as wearing black clothing.
DS Reid added: “If you think you recognise the descriptions of the offenders and may know who they are or have any other information that may aid our investigation, no matter how small, please get in touch with us here at Warrington Police Station.
“That includes any information regarding the stolen bicycles. Perhaps you have seen them since they were taken from the victims or been offered the chance to buy them.”
Anyone with information or footage that may help detectives with their investigations should call Cheshire Constabulary on 101, quoting IML 339969 (first robbery) or IML 340052 (second robbery), give the details via https://cheshire.police.uk/contact/general-enquiries or contact Crimestoppers anonymously on 0800 555 111.