Senior constabulary officers person written to the Prime Minister astir the hold successful introducing a information instrumentality successful the aftermath of the Manchester Arena bombing.
The letter, besides signed by relatives of coercion victims, said a hold successful introducing a instrumentality to amended information astatine nationalist venues is "dangerous".
Plans for the law, known arsenic Protect Duty oregon Martyn's Law, were announced successful May but the measure has yet to beryllium tabled.
The BBC has asked the authorities for a response.
The authorities has antecedently said it is "committed" to bringing guardant the legislation.
The measure go known arsenic Martyn's Law aft Martyn Hett who was among 22 radical killed successful the 2017 Manchester Arena attack.
It was mentioned successful the Conservative Party's manifesto successful 2019 and volition compel astir nationalist venues to person due information procedures successful spot and to supply grooming for venue staff.
Mr Hett's mother, Figen Murray, who was precocious made an OBE for her counter-terrorism work, signed the missive and has antecedently said delays bringing successful the instrumentality "risked lives".
"I cognize authorities has been successful turmoil successful caller months, but determination is nary excuse for delaying oregon weakening authorities that could prevention thousands of lives.," she said recently.
Anil Basu, erstwhile caput of UK counter-terrorism policing, and British Transport Police main Lucy D'Orsi are among the signatories. Brendan Cox, widower of murdered Jo Cox MP, besides signed.
"Since the horrific onslaught successful Manchester successful 2017 determination person been 8 further attacks successful the UK," the missive says.
The attacks person taken spot successful smaller places oregon venues alternatively that stadiums wherever information has been improving, it continued.
This menace to smaller venues is simply a situation to quality and policing services and information is not thing that tin beryllium near to those services alone, it said.
The Protect Duty "would inquire each nationalist venues to instrumentality elemental steps (such arsenic unit grooming and basal information planning) to trim the interaction and hazard of a panic attack."
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