DUBLIN (CBS SF) — Two inmates who walked away from a minimum security federal prison camp in Dublin continued to elude recapture Thursday more than two weeks after their escape, authorities said.

(L-R) Anna Armstrong, Irene Alina Michell (U.S. Marshals Service)

Irene Michell and 34-year-old Anna Armstrong walked away from the Federal Correctional Institution at Camp Parks in Dublin at around 7:15 p.m. on Labor Day. And while Michell was spotted in rural Livermore in the days following her escape, Armstrong has not been seen.

Earlier this week, the federal prosecutors added escape charges to the drug charges the women were being held on. The new counts carry a maximum penalty of five years in prison, a $250,000 fine and three years federal probation.

But first, the U.S. Marshals Service will have to find them.

Armstrong – described as Caucasian with brown hair and hazel eyes, 5 foot 5 inches tall, and 175 pounds – was sentenced this year to a 63-month prison sentence for federal narcotics charges, the marshals service said.

She is believed to have family ties in Yuma, Arizona and Lancaster, California.

Michell was sentenced in 2014 to a 110-month prison term, also on federal narcotics charges. The marshals service said she has a lengthy criminal record which includes theft, assault, fraud, identity theft, and possession of stolen property.

She is Native American, about five foot 8 inches, 180 pounds, with brown hair and brown eyes. Michell also has a neck tattoo which reads “Adan.”

Anyone with information on the two was asked to call the U.S. Marshals Service fugitive tipline at 1-877-926-8332. Anonymous tips can be submitted online at northerncaliforniamostwanted.org