Two children have allegedly been assaulted at the St Peter Port bus terminus.
Police say it happened at around 5:25pm on Tuesday 31 May.
Officers want to speak to anyone who saw what happened.
The force also wants people in the South Esplanade and bus terminus area with CCTV to come forward.
Anyone with information is asked to call PC55 Le Bachelet on 222 222 or Crimestoppers anonymously on 0800 555 111.
New signs show walk and cycle times to CI town centres
New signs have been placed around St Peter Port and St Helier, showing how long it takes to walk or cycle from key locations into town.
Dolphin sculpture snapped by vandals
One of the dolphin sculptures on Guernsey's new trail has been vandalised.
Guernsey gets its 'youth club on wheels'
The Youth Commission has launched 'The Bus Stop' - a fully equipped, solar-powered mobile youth club.
TAKE A LOOK: Princess Anne visits Guernsey and Sark for Liberation 80
The Princess Royal has attended commemorations marking the 80th anniversary of Liberation in Guernsey and Sark.
WW2 tortoise to star in Guernsey's Liberation Cavalcade
One of the only surviving pets from the Second World War will be joining Guernsey's Liberation Day Cavalcade.
Guernsey Marinas aims to become 'premier marine destination'
In a brand refresh Guernsey Marinas - part of Guernsey Ports - will focus on bringing more private leisure boat visitors to the island.
How Guernsey is celebrating 80 years of Liberation
Events are going on across the island for the landmark anniversary of the end of the German occupation.
New Guernsey postbox topper celebrates Liberation 80
Islanders might have spotted a new celebratory postbox topper outside town church.
