Aviation regulator DGCA has already started collecting evidence from the crash site which would help the AAIB in its probe, a senior official said.
"The DGCA officials are already on the crash site to collect evidence for probe. Since, ab initio its an accident, Aircraft Accident Investigation Bureau (AAIB) will be conducting a probe into it. We are sending a team of investigators to Mumbai tomorrow to start the probe," a senior AAIB official told PTI.
One person was killed and three others were injured when a helicopter crashed in the Goregaon suburb of the western metropolis.
The helicopter crashed in an open ground in Aarey colony, a green belt in suburban Goregaon, and caught fire, according to the city fire department officials.
Local residents alerted police and Fire Brigade after they spotted smoke billowing from the crash site.
Four persons, all occupants of the chopper, suffered burns and were rushed to a hospital where one of them succumbed to injuries, said DCP (Zone 12) Kirankumar Chavan.