NAIROBI, Kenya—An Ethiopian drone strike has killed 17 civilians in the country’s Tigray region on the day that President Joe Biden during a call with Prime Minister Abiy Ahmed expressed concern about such attacks in the ongoing war, local authorities say. A report by the zonal administration said women at a flour-grinding mill made up most of those killed in the Monday drone strike near Mai Tsebri, a source who saw the report told The Associated Press. The source spoke on condition of anonymity because they were not authorized to speak about it to reporters. Such drone strikes have been reported almost daily in Tigray, a humanitarian worker in the town of Shire told the AP, with an attack over the weekend on a displaced persons camp in Dedebit killing at least 57 people and wounding more than 130, many of them children. The aid worker shared photos of partially …