Al-Qaeda's revitalization in Afghanistan has both Afghan and U.S. officials concerned about the group's potential.
Afghan Acting Defense Minister Masoom Stanekzai said: "They are really very active. They are working in quiet and reorganizing themselves and preparing themselves for bigger attacks."
The concern isn't in numbers, which are low compared to terrorist groups like ISIS, but in strengthening ties Al-Qaeda has to the Taliban.
Several countries, like the U.S. and Afghanistan, have long tried for peace talks with the Taliban, and say it could be the only way to attain "lasting peace and stability in Afghanistan and the region."