A grassroots anti-drug organization whose members are on a march through northern Myanmar to destroy opium poppies in farmers' fields say 14 of their members were wounded when they were attacked with automatic weapons and hand grenades.

Members of the Pat Jasan organization said they did not know the identity of the men who attacked them Thursday as their march of more than 1,300 members continued through Kachin State.

One member was previously shot to death and three wounded by a land mine earlier this year.

The group was formed about two years ago because of increasing drug abuse in the Kachin community. It faces opposition from poor farmers who make a living from growing opium — from which heroin is derived — and ethnic militia groups trafficking in drugs.