India's aviation safety watchdog said on Tuesday surveillance conducted on Air India's Boeing 787 fleet did not reveal any major safety concerns, days after one of its jets crashed, killing at least 271 people.

Speculation is rife about the causes of the disaster, as experts begin to piece together how flight AI171 crash unfolded

In a statement reported by Indian newspaper The Tribune, the Directorate General of Civil Aviation (DGCA) said its recent inspections had thus far found no issues with the 787s themselves or with their maintenance,