India would not allow a UN investigator to join a probe of a crashed Air India jet that some safety experts had criticized for delays in analysis of crucial black box data, two senior sources familiar with the matter told Reuters.

Investigators have begun analyzing data from the black boxes recovered from the Air India Boeing 787 jet that crashed earlier this month, killing 270 people.

In the latest episode of Newshour Agenda, Madhavdas G.K. breaks down the AI-171 crash investigation. The AAIB and US NTSB have extracted crucial data from the black boxes—CVR and FDR. But does the probe meet global aviation standards?