Neighbourhood Policing Team in the area all daypublished at 10:55 British Summer Time 10 July
Det Supt Rob Hall added: "Our inquiries will continue over the coming days to ascertain the full circumstances of what happened, but I would also like to take this opportunity to appeal to anyone who was in the area around Ashlyn Close from around lunchtime on Tuesday until 7pm, and believes they may have seen anything that could assist the investigation, to contact us.
"This incident will of course be of concern to local residents.
"Officers from the Neighbourhood Policing Team will be in the area today so please do speak to them if you need to."
Herts Police have posted full details, and contact information, on Facebook, external.