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6 August 2015, 08:08
A man was seen in the garden of a property in Writtle off Margaretting Road at 8.50pm on Tuesday, August 4.
The householder, a 40-year-old man, went outside to investigate and was assaulted by the suspect, who had an accomplice.
The pair then demanded and stole a quantity of money from the victim, a gold Mercedes E250, jewellery, a watch and mobile phones.
Det Sgt Andy Glister, of Chelmsford CID, said: "From the information we have gathered, we believe the victim was not the intended target of this nasty incident.
"He needed hospital treatment for a head injury, and although now recovering from the physical assault, is extremely shocked by what happened.
"This was a frightening incident that took place in front of his wife and their three children, who are aged between 11 and 15.
"One of the youngsters was so traumatised that he also needed treatment for shock.”
Police carried out a search of the area but could not locate the suspects.
One of the men was white, about 6ft tall and of stocky, muscular build. He was aged about 30, had tattoos on his arms and an Essex accent.
The other suspect was white, about 6ft tall and skinny.
Witnesses or anyone with information are asked to call Chelmsford CID on 101.
Alternatively, they can contact Crimestoppers anonymously on 0800 555111 or www.crimestoppers-uk.org