Away from crime, LGC also offers meat species testing, such as detecting the presence of horsemeat in food products.

BBC: LGC forensics firm to cut 170 jobs

On the same day, LGC Forensics in Abingdon, Oxfordshire, and the Forensic Science Service in Birmingham, received similar devices in the post.

BBC: NEWS | UK | Accused's home a 'bomb factory'

LGC's UK laboratories are in Culham, Leeds, Runcorn in Cheshire, St Neots in Cambridgeshire, Tamworth in Staffordshire, Teddington, Risley in Cheshire, and Wakefield in West Yorkshire.

BBC: LGC forensics firm to cut 170 jobs