Police were called to Regency Court at around 1:30 a.m. and upon arrival discovered that three people had been injured.
Despite the efforts of doctors, two of this group died. Their families are supported by specialized officers.
The third victim was treated for injuries that neither endanger nor change his life.
Police are now trying to establish how the boys died and a forensic autopsy will be performed.
Chief Detective Inspector Andy Clarkson of Kent and Essex The Serious Crimes Directorate said, “This incident required an immediate and large-scale response and officers and investigators worked through the night to piece together what happened prior to this tragic incident.
“Our investigations will continue throughout the day.
“We understand that there will naturally be shock and concern within the community after such a tragic loss of life. But, at this point, we don’t think there is a broader threat to the public.
“We know there have been a number of witnesses to this incident and I urge anyone who has seen anything at Regency Court and the roads surrounding it in central Brentwood between 1am and 2am. in the morning to show up and talk to us if you haven’t already. “
Chief Inspector Mark Barber added, “There will continue to be a very visible police presence in Brentwood this morning and even throughout the day.
“I am fully aware that this incident will shock a lot without the community. My officers will be there all day – they will be there to reassure and protect you. If you have any concerns or information about the incident then please do not hesitate to introduce yourself and talk to them. “
Anyone who has witnessed the incident or has information about it should call the police on 101 and quote incident 125 and the date of October 24.