Members of a volunteer border watch group that attached political flags to security fencing on the US-Mexico border have been told by the US Border Patrol to remove them.

American Border Patrol, a not-for-profit watchdog that monitors the US government's border activity and developments, fixed approximately 16,000 flags on a stretch of the border fence in July this year, the Sierra Vista Herald reports.

The flags, along with five banners, contain messages from individual Americans and were deployed to celebrate Independence Day and to remind the government that 700 miles of security fencing still needs to be built.

On July 5th, the five banners were removed, but the flags remained.

Colleen Agle, a spokeswoman for US Border Patrol, told the newspaper that messages or banners cannot be placed on federal property without approval or permission.

"The flags carry political messages, which cannot be displayed on federal property," she said.

According to reports, the security fencing on the US-Mexico border stretches for 643 miles.ADNFCR-3337-ID-800209227-ADNFCR