India, June 9 -- The Directorate General of Civil Aviation (DGCA) on Monday said it has introduced surprise audits and enhanced surveillance of helicopter operations in Uttarakhand following "multiple" incidents involving choppers used by pilgrims during the Char Dham Yatra.

Four incidents have been reported in connection with helicopter operations in Uttarakhand after the pilgrimage started on April 30.

The aviation regulator referred to these incidents, saying "multiple occurrences involving helicopter operations during the Char Dham Yatra" had been reported this year, which underscored the "necessity for further strengthening the safety oversight of these operations".

"Reaffirming its steadfast commitment to aviation safety, DGCA is...