An investigation is under way after two boys were threatened and had their phones stolen.
Sussex Police said the incident happened in Rook Way, Horsham, at around 6pm on Tuesday.
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A spokesman for Sussex Police said: "Officers were called to a report of a robbery which took place near Rook Way, Horsham at around 6pm on June 11."
He said it was reported that two boys had their phones stolen and were threatened by three robbers. An investigation is ongoing, he said.
Witnesses or anyone with any information or footage is asked to contact police online or call 101 quoting serial 1187 of 11/06.
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