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.
Work to commence on 70 affordable flats and homes in Guernsey
Construction will begin this summer on the affordable housing project at the former CI Tyres site, now known as Court Falaise.
A new tax, more 'proportionate' to wealth, to be put to Guernsey's States
Deputy David Goy initially wants public feedback on a new tax system that would look at alternative sources of revenue, rather than GST.
Guernsey gives £75k for Islands Unlimited inter-islands sailings
Guernsey taxpayers have given inter-islands ferry service Islands Unlimited a £75,000 grant
Guernsey tax package to raise more States income but protect low earners
GST at 3% combined with benefits and States savings will bring in 59M a year.
Changes to make Guernsey's buses more reliable
Bus operator Stagecoach and Guernsey's States have tweaked the timetable to offer a more effective service.
Aurigny plane makes emergency landing after leaving Guernsey
The ATR diverted to Southampton, and landed without incident, after a windscreen cracked in flight.
New festival part of Guernsey's Seafront Sunday
Fete d'la Mair will unite everyone with a love of Guernsey's varied and beautiful coast.
Guernsey firefighters tackle round-island walk in full kit
A team of firefighters will walk 39 miles around Guernsey today (Saturday 6 June) wearing their heavy kit.
