The incident happened when Mukherjee was going to Kanidighi, about 25 km from the MDI helipad in Murshidabad, to inaugurate a school, officials said.
After some time, officials in the tail car, the last car in the 20-vehicle cavalcade, heard the siren of an ambulance. Wasting no time, the presidential motorcade gave way so the ambulance could pass through, they said.
It was not immediately clear who was inside the ambulance.
Mukherjee today began a two-day tour of West Bengal, his last to his home state as president.
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