Witnesses are being sought after an offender placed a mobile phone through an open window while a woman was taking a shower.
The incident happened in Postmill Close, Ipswich, at about 5am on Sunday.
The woman, 34, shouted when she realised what was happening and the offender, who is described as white, ran away.
If you were in the area at the time and have any information, call PC Conor Ward from Ipswich on 101, quoting the crime reference IE/13/3060
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