Reuters could not independently verify the information from the AA, which is one of three ethnic minority insurgent groups that launched a coordinated offensive against junta forces in late October.
A curfew has been imposed in the Rakhine State capital Sittwe, where military tanks have been sighted, the administration there said.
A junta spokesperson, Zaw Min Tun, on Tuesday accused the rebel groups of "destroying the whole country" and said reports of captured military posts were "propaganda".
He did not comment on reports of junta forces surrendering.
Most of the Myanmar soldiers were flown by Indian forces to another point on the border and handed back to Myanmar authorities, said an Indian security official who declined to be identified.
Persons:
Nobel, Aung, Min Tun, Kanupriya Kapoor, Robert Birsel
Organizations:
REUTERS, Arakan Army, Reuters, AA, Myanmar, Thomson
Locations:
Myanmar, Myanmar's Khawmawi, India, Zokhawthar, Champhai district, India's, Mizoram, Rakhine State, Sittwe, China, Suu Kyi, Shan, Rakhine, Chin State