* An 18-year-old man and a 17-year-old male, both from Liverpool, were arrested on suspicion of robbery on Wednesday, March 4.
* They were taken to local police stations where they remain for questioning.
A teenage boy was threatened at knifepoint before thugs stole his coat, bag and watch.
The 16-year-old was also forced to hand over his phone and cash during the violent ordeal on Monday afternoon.
Police were called shortly before 2pm to reports that a boy was walking along a path between Main Avenue and Edge Road in St Helens when he was approached by two males.
One of the thugs pulled a knife of the victim, before the pair made threats and took the child's possessions.
Merseyside Police issued a description of the two robbers in a statement about the incident.
The force said: "The offenders, described as two black males wearing hoods, made off and the victim reported the incident to police.
"He was left uninjured but extremely shaken.
"An investigation is underway and detectives are keen to speak to anyone with information."
Detective Inspector Jackie Guinness said: “This would’ve been an extremely frightening incident for the young victim, who thankfully wasn’t injured, and we are carrying out a number of enquiries to locate the offenders.
“We are particularly keen to speak to a male who is believed to have walked past at the time of the incident, and was possibly also approached himself by the offenders.
"If this is you, or you witnessed the incident or anyone in the area at the time that fits the description of the offenders, please let us know.
“Likewise, if you have any dashcam or CCTV footage from the Broadway, Upland Road or Main Avenue areas, please get in touch.”
Please contact @MerPolCC, 101 quoting ref. 20000134690 or @CrimestoppersUK on 0800 555 111 with information.
