It is being treated as a targeted attack on a victim who is known to the suspect. The force had been called to an address in the Borehamwood road at around 12.15pm, with reports that a suspicious object had been located. Representatives of Herts Police and Hertsmere Borough Council have made comments on the situation in the last few days. "The criminal investigation remains live and a police presence will remain in the area for the time being. The investigation into the nature of the object remains ongoing and thorough enquiries are underway.