Police have released details of what they are describing as a racially aggravated assault in Aldenham Road, Bushey, on Thursday last week.
Between 2.50pm and 3pm, a black woman was walking down Aldenham Road towards Vale Road when a black hatch-back car pulled up alongside her.
A man in the front passenger seat, who was believed to be wearing a Halloween style mask similar to that worn in the Scream' films is believed to have thrown a water balloon at the woman and shouted racial abuse.
It is believed there were two other men in the car which may be a Vauxhall or VW Polo.
PC Geoff Webb from Bushey Neighbourhood Team said: "This was very distressing for the woman involved.
"We are keen to speak to anyone who may have seen this incident or who has information which could help with our inquiries.
"Please contact police on 0845 33 00 222 and quote reference J2/08/731."
Alternatively, call Crimestoppers anonymously on 0800 555111. You do not have to give your name and could be entitled to a cash reward.
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