New Delhi, Jan. 31 -- Ethiopia's national carrier canceled flights to and from the troubled northern region of Tigray, as fears grow of renewed fighting between federal troops and regional forces.

For a second day, Ethiopian Airlines wasn't flying to Tigray on Friday, with customers receiving messages that cited "unplanned circumstances."

The carrier issued no public statement. Ethiopian authorities also didn't comment.

A high-ranking official in the security service told The Associated Press on Thursday that the suspension of flight services to Tigray was "linked to a new conflict between federal troops and the regional forces."

The official, who wasn't authorized to speak to a reporter and requested anonymity, said that "drones are ...