The bomb squad safely detonated dozens of incendiary grenades found buried in a field in Sibton near Saxmundham on Bank Holiday Monday.
Suffolk Fire and Rescue Service, Suffolk police and the British Army's bomb disposal team were called to the scene in a field off Halesworth Road at around 12.10am on Monday, May 27, following the discovery of 24 self-igniting phosphorous grenades (SIP Grenades).
The Second World War era explosives were removed from the area by the bomb squad and detonated safely in a 2ft deep trench.
Firefighters were on hand as the material the grenades contain continues to burn long after they have been detonated.
Fire crews returned to the scene on Tuesday morning to make sure what was left of the grenades had burned away safely.
The Home Guard hid caches of SIP grenades, which were also known as the No. 76 grenade, during the war for use in the event of an invasion.
Glass bottles were filled with benzine and white phosphorus which ignited when smashed as the ingredients reacted with the air, producing choking fumes and a immense heat.
A fire service spokesman said: "Suffolk Fire and Rescue Service we asked to assist with an incident at Halesworth Road, Sibton on Monday.
"A box of SIP (self-igniting phosphorus) grenades which had been previously buried was uncovered.
"24 Second World War era grenades were removed by bomb disposal teams and taken to another location for safe detonation, where they were placed in a 2 foot deep trench.
"Suffolk Fire and Rescue Service were in attendance as the grenades will produce a flame once detonated.
"The fire service continues to monitor the site as the fuel continues to burn away."
A spokesman for Suffolk police said: "We were called shortly after 10.55pm on Monday, May 27 following reports of self igniting phosphorus grenades which had been located on land off Halesworth Road.
"Officers attended and the bomb disposal team were made aware.
"The fire service were called due to the volatility of the items. "The bomb disposal team arrived at around 1pm and conducted a controlled explosion."
She said officers left the scene at around 8pm.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here