KABUL, Afghanistan — Afghan forces launched a lightning operation in northern Kunduz province on Monday, rescuing 149 people, including women and children, abducted by the Taliban just hours earlier, officials said. By midafternoon, fighting was still underway in the area to free 21 remaining hostages, officials added. The operation was a boost for Afghan forces, which have struggled to contain a resurgent Taliban on battlefields across the country. On Monday morning, the Taliban ambushed a convoy of three buses travelling on a road in the Khan Abad district, and forced everyone to come with them, according to Nasrat Rahimi, deputy spokesman for the Interior Ministry. Rahimi said that after Afghan security forces freed 149, the insurgents were still holding 21 hostages from the buses.