Investigators in India are studying the black boxes of a Boeing 787 Dreamliner after recovering them from the aircraft wreckage to ascertain the cause of last week’s plane crash that left at least 270 people dead.

India will send the black box recovered from the recent fatally crashed Air India plane to the U.S. for analysis, local newspaper Economic Times reported on Thursday, citing people aware of the development.

Investigators involved in ascertaining the cause of the tragic Air India plane crash have found the black boxes from the accident site in Ahmedabad. The black box is considered a key instrument in aircraft crash probes as they hold crucial flight data.