Thames Valley Police is re-appealing for specific witnesses following an aggravated burglary in Earley, which left a man with a broken arm.
The late-night heist took place between 11.30pm on Wednesday, January 26, and 12.30am on Thursday, January 27, at a home in Wokingham Road, which straddles the Reading and Wokingham border.
The victims, a man and woman both in their 60s, were alerted to four men entering their home armed with crowbars.
The offenders took mobile phones from the victims before searching the property.
The man sustained a broken arm and cuts to his head and lips.
He was treated at Royal Berkshire Hospital for his injuries and has since been discharged.
Jewellery with an estimated value of £30,000 was stolen.
The offenders were described as wearing all black from top to bottom and wore balaclavas.
Investigating officer, DS Mark Boyd, based at Loddon Valley police station, said: “We are appealing for anyone who was in the area at the time of this incident and saw anything suspicious to contact us.
“We would like to specifically reach out to people that were in the Soel Joel Park until around 1.30am on the night of the incident, in the hope they come forward.
“We would also urge anyone with relevant CCTV or dash cam footage to get in touch.
“To report any information you can call 101 or make a report online, quoting reference 43220038645.
“Alternatively, if you wish to remain anonymous, you can contact the independent charity Crimestoppers on 0800 555 111 or via their website.”