Following the incident, the Army suspended slithering operations involving Dhruv helicopters till a probe was completed, the sources said.
Three Indian Army soldiers received injured while slithering down from a chopper as the rope suddenly got snapped because of a "material malfunction".
At least three Indian Army soldiers were injured after they fell from a helicopter in a freak incident during rehearsals for Army Day celebrations in New Delhi.
According to media reports, the rope with which the soldiers were practising slithering operations broke.
The sources said a separate inquiry on technical aspects of the incident has also been ordered.
"Slithering operation ceases for all ALH with immediate effect after the accident".
A video shows two soldiers sliding down the rope hanging from Dhruv helicopter.
The incident raises serious concern on the safety measures being carried out while conducting such kind of drills. "An investigation is in progress", said an Army officer.
Army Day is celebrated on January 15 every year in remembrance of Lieutenant General KM Cariappa's taking over as the first Commander-in-Chief of the Indian Army from the British General Sir Francis Butcher.
ALH Dhruv is an indigenously developed helicopter manufactured by Hindustan Aeronautics Limited.