Paris on Tuesday reached out to New Delhi by promising a thorough investigation into the killing of two Indians by French troops guarding Central African Republic capital Bangui's international airport.Establishing contact at the highest level, French President Francois Hollande spoke with Prime Minister Manmohan Singh, who is on a visit to South Africa, expressing regret at the killings and promised to share results of the high-level investigations.Hollande also ensured best possible treatment for the six Indians who were injured in the firing. They have been moved to a hospital in Chad capital N'Djamena.French Defence Minister Jean-Yves Le Drian separately called his Indian counterpart A.K Antony to convey his regret over the incident.New Delhi has sought protection for around 100 Indians who are present in the violence-hit Central African Republic.Diplomatic sources told Mail Today that situation in the country is extremely volatile and the request for the protection of Indians in CAR has been sent to the French forces on the ground.France increased its troop deployment from 250 to around 550 after escalation of violence following President Francois Bozize fleeing the country and rebels taking Bangui.French troops are guarding Bangui airport where the shooting incident took place on Monday. According to a communique issued by the French defence ministry, three vehicles had threatened to penetrate the security at the airport.The French troops fired precautionary shots but the vehicles continued to proceed at high speed. Two Indians were killed in the subsequent firing.The injured were immediately moved to Chad and were given full medical assistance. They were employees for a company operating in the region, said sources.The identity of Indians has been established on the basis of their documents, said sources, and it has been conveyed to the ministry of external affaris.France has assured that best possible treatment will be provided to the injured Indians.Diplomatic sources said the confusion arose as French troops were earlier fired from an unknown source.The Seleka rebels forced Bozize, who came to power after a coup in 2003, to flee to Cameroon. The rebel attack left 13 South African soldiers dead leading to widespread condemnation. South Africa had deployed 200 soldiers to CAR.Sources said India was a friendly country and keeping in view the sensitivities, Paris offered to share the probe findings. Diplomatic contacts were established at the highest level to convey regret.