Detectives have charged seven people over allegations they conned elderly people in Essex out of around £1 million.
Essex Police said there were around 40 victims aged between 65 and 99.
Sixteen people were arrested in Colchester, Clacton and Epping yesterday.
Seven have been charged with conspiracy to commit fraud by false representation between 2009 and 2013. The charges relate to work carried out on victims' homes at inflated prices.
Six men will appear at Colchester Magistrates' Court later today. A woman has been bailed to appear in court on July 16.
The remaining nine people have been released on bail until next Wednesday.
More top news
No EU national currently living lawfully in the UK will be made to leave on the day of Brexit under proposals outlined by Theresa May.
Nominations are now open for the 2017 ITV Fundraiser of the Year – part of the Daily Mirror Pride of Britain Awards.
There are fears from the fruit industry in the UK that a shortage of seasonal workers from the EU will get worse because of Brexit.