Two teenagers were robbed by men in a Luton play area on Saturday.
At around 4.10pm a boy and girl were in the play area in Crawley Green Road when they were approached by the two men on a grey moped.
The men threatened the pair and demanded they hand over their mobile phones before stealing them and driving out of the park.
PC Mirian Khajavelidze said: “This was a brazen robbery that happened in broad daylight and was a scary experience for the victims.
“We are urging anyone who may have seen the incident itself or has seen two men riding on a grey moped in the area to get in contact with us.”
Anyone with information is asked to contact police on 101 quoting C/35880/16. Alternatively, contact Crimestoppers anonymously on 0800 555 111.