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.
Guernsey's greenhouse gas emissions fall
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Work on Guernsey's Victor Hugo Centre may begin by Easter '27
Progress is being made on the Victor Hugo Centre on Guernsey's seafront, after enough money has been raised to fund its capital costs.
Channel Islands mobile portability issues to be resolved soon
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Channel Islanders in the Middle East told to follow local warnings
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Freehold of Guernsey's Premier Inn for sale
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Unprecedented demand for cesspit emptying in Guernsey
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Food will not be exempt from GST in Guernsey
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Victor Hugo Centre fund reaches £7.5M
Guernsey's Victor Hugo Centre has reached three-quarters of its £10M target, as a bronze sculpture of the famous French writer is unveiled to the public.
