An appeal for witnesses has been launched following an altercation between a man and a woman in Hemel Hempstead.
The incident occurred between 10.57am and 11.10am on Tuesday, in the car park of Everyone Active on Park Road.
"Our enquiries are continuing, and we are appealing for anyone with information to please get in touch," said Detective Constable Carina Ng, investigating.
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"We believe there may have been several people in the car park at this time, and there could be a number of key witnesses as a result. If you have any information, please email me at carina.ng@herts.police.uk."
You can also report information online at herts.police.uk/report, speak to an operator via online web chat at herts.police.uk/contact or call the non-emergency number 101, quoting crime reference 41/21148/23.
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Alternatively, contact Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org.
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