Air India Chief Executive Campbell Wilson has urged employees not to jump to conclusions about the cause of last month’s fatal crash involving one of the airline’s Boeing ( NYSE: BA) 787 Dreamliners, emphasizing that the investigation remains ongoing and far from complete, The Wall Street Journal reported Monday.

Air India CEO Campbell Wilson says no technical or maintenance issues have been found in flight AI171 that crashed in Ahmedabad. A probe revealed that engines lost fuel supply mid-air.

Air India CEO Campbell Wilson said the Aircraft Accident Investigation Bureau’s (AAIB) preliminary report found “no mechanical or maintenance issues with the aircraft or engine,” reported Hindustan Times. Urging caution, he noted the report identified no cause nor made any recommendations and asked everyone to avoid “drawing premature conclusions.”