Several killed in flag-waving protests against Taliban in Afghanistan

Leader of anti-Taliban opposition supports protests; Taliban tell people with no travel documents to leave airport

Flag-waving protesters took to the streets of more Afghan cities on Thursday as popular opposition to the Taliban spread, and a witness said several people were killed when the militants fired on a crowd in Asadabad in the east.

"Our flag, our identity," a crowd of men and women waving black, red and green national flags shouted in the capital Kabul, a video clip posted on social media showed, on the day Afghanistan celebrates independence from British control in 1919.

A witness reported gunshots fired near the rally, but they appeared to be armed Taliban shooting in the air.

One woman walked with