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.
Man charged following a bomb scare in a Guernsey nightclub
Police have charged and bailed a 33 year old under a Terrorism Law offence after an alleged incident at Folies nightclub.
Guernsey FC's play-off final to be held at Victoria Park
Guernsey FC will officially be able to compete for promotion on home soil, after league's U-turn.
Guernsey celebrates 81 years of Liberation
The main focus is on St Peter Port with some 20,000 people expected to come and go during the day.
Survey launches on future use of Guernsey's territorial waters
People in Guernsey are being asked to share their views on how the island’s surrounding waters should be used.
WW2 bombs to be left undisturbed near Guernsey housing estate
The UK Ministry of Defence say the fuses on 2,000lb weapons are not armed and the bombs are 'highly unlikely' to self detonate.
Guernsey FC's play-off final moved to the UK
The club says it will lose home advantage and it does not accept the league's decision.
Guernsey deputy loses committee support
Policy and Resources says it will not nominate deputy Gavin St Pier when he resigns from the committee to seek re-election.
Iconic football trophies to be displayed in Guernsey
Islanders will be able to see pieces of football history in person later this month.
