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.
Annual Guernsey Scarecrow Festival set to raise thousands for charity
£10,000 was donated to five Guernsey charities and organisers hope for a similar amount this weekend.
Channel Islands face 'physical' Poland test
The Channel Islands rugby team play their second ever game this weekend - and this time in Jersey.
Baby born on Guernsey's Marine Ambulance
During an emergency transfer from Sark to Guernsey, Harriet Magell was born.
New interim leader for Guernsey's healthcare system
Teresa Cope has senior management experience in the NHS and has recently led the Isle of Man's care system.
Guernsey's reservoir levels falling after prolonged dry spell
Water storage takes a multi-million-litre hit after successive heatwaves.
Guernsey's Commonwealth flag carrier in early Games win
Guernsey bowlers Alison Merrien and Rose Ogier have won their first match in the women's pairs in Glasgow.
Abundant year for jellyfish in Guernsey waters
Social media lights up with pictures of compass jellyfish, but they are relatively common in the summer.
Battery fire ignites in Guernsey waste processing centre
Islanders are being reminded to dispose of batteries properly following a fire.
