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.
Another successful Alderney Week
More than a thousand people took part in a Torchlight Parade in St Anne on Saturday (8 August) - including a famous footballer.
Guernsey hospitality industry criticises "damaging" population management
The States say industry feedback will help shape future population management, after a hospitality couple said the system is "damaging businesses".
Fairgrounds, flowers, and firebreathers planned for Guernsey's North Show
The North Show returns to Saumarez Park over two days in the last week of August.
Young Guernsey cricketers 'should feel proud' after World Cup exploits
Guernsey's under-19 cricket team is being hailed after they competed against some of Europe's top talent in World Cup qualification action.
Dot GG and dot JE turn 30
For three decades, Channel Island websites have used unique internet domains.
Guernsey band to perform at the UK's biggest heavy metal festival
On Saturday 8 August, APOTHIS will perform at Bloodstock, in Derbyshire.
Guernsey Dairy marks 75 years at the Bailiff's Cross
The serving Bailiff will meet staff at the Bailiff's Cross Dairy on its platinum anniversary.
Guernsey Voluntary Service needs minibus licenced drivers
D1 category licence holders asked to help out for a few hours a week.
