Hazardous material team were sent to the scene of a crash on Salisbury Plain involving three troop carriers in which 20 soldiers have been injured.
Two solders have been air-lifted to hospital with what are described as "life-threatening injuries." Several others involved in the crash on military land near historic Stonehenge have been described as having life-changing injuries. A number of others are said to be "walking wounded."
Early reports said teams specialising in dealing with hazardous substances were at the scene though it is unclear why.
Wiltshire Police said they received a call at about 6.30pm that there had been a crash near Larkhill in Wiltshire.
A spokesperson for Wiltshire Police said: "We received a call from the air ambulance who told us they were attending. First responders and three military ambulances were also at the location, a field on The Plain near Westdown Camp."
Sky News is reporting that the army had been conducting joint exercises with the Indian military and many of those injured may have been Indian.
Separately the police added: "The [collision] happened on a by-way which cuts through The Plain, hence why we were called. It is still regarded as a Wiltshire Police matter as it's on a by-way, although it's off the main road."
A spokesman for the Ministry of Defence said: "We are aware of an incident in the training area of Salisbury Plain. We are not absolutely certain of the details and until we are, we will not be making any comment."