NEW DELHI, July 14 (Reuters) - A preliminary investigation into the crash of an Air India passenger jet last month that killed 260 people raises additional questions about the incident and the investigation is far from over, Air India's CEO said in a memo on Monday.

Campbell Wilson told staff in a memo that the pilots had passed a mandatory preflight breathalyzer test.

The CEO of Air India urged his staff to not jump to conclusions after a preliminary report over last month’s deadly crash ruled out mechanical or maintenance issues, suggesting it may have

Air India's CEO Campbell Wilson addressed employees following the preliminary report on the AI 171 crash, which claimed 270 lives. The report found no