Detective Inspector Iwan Jones told a pre-inquest review hearing in Aberdare Coroner's Court the scale of investigation had widened:
Having reviewed some of the evidence we have decided to expand the investigation. We aiming to have statements from a substantial number of soldiers - between 94 and 96 - emergency service personnel and members of the public.
We are still waiting for (all of the) soldiers accounts from the army at this moment in time. There have been logistical problems as some of these are now serving abroad."
Police investigating the deaths of three soldiers, including one from Bath, who died during an SAS selection programme in the Brecon Beacons say they have not yet interviewed everyone they would like to.
Army reservists Edward John Maher, 31, Craig John Roberts, 24, and 31-year-old James Dunsby (from Bath) died while taking part in a gruelling SAS selection exercise on one of the hottest days of the year. A number of other soldiers also collapsed and needed medical attention.
It is thought the group were carrying out an exercise known as the "Fan Dance", which involves marching up 886-metre high Pen Y Fan mountain and down the other side carrying a weighted pack and rifle, then doing the route in reverse, in a set time.
An inquest has heard how a soldier from Bath, who died following an SAS training exercise, suffered multiple organ failure.
Corporal James Dunsby, was pronounced dead in hospital 17 days after collapsing in the Brecon Beacons on South Wales's highest mountain, Pen Y Fan, on one of the hottest days of the year. Fellow reservists Edward John Maher and Craig John Roberts also died in the incident.
The family of Corporal James Dunsby have paid a loving tribute to him, saying "a greater man you could not meet".
Cpl Dunsby became the third army reserve soldier to die from injuries sustained during SAS selection training in the Brecon Beacons.
His family said: "James was and will remain a dearly loved, son, brother and husband. He had the uniquely wonderful ability to endear, enchant and captivate all who he met with his naughty sense of humour and highly intelligent wit.
"With James as your friend you were ensured loyalty, strength, allegiance, protection and most of all a damn good laugh. James adored the Army and believed so passionately in his duty as a protector of Queen and country and of the realm.
"James was so dearly loved by so many and will be sorely missed. Hurrah & Huzzah for James Dunsby; a greater man you could not meet."