( CNN ) -- Three Afghan National Army officers -- guests of the U.S. military at a training exercise in Massachusetts -- disappeared on Saturday and reappeared Monday in the custody of Canadian border guards . The men are in custody at the Rainbow Bridge , a checkpoint on the border at Niagara Falls , and are being interviewed by federal authorities , Massachusetts State Police David Procopio said . The military , State Department and other government agencies are remaining especially quiet about the choice the three Afghan officers made to go off the radar . Maj. Jan Mohammad Arash , Cpt . Mohammad Nasir Askarzada and Cpt . Noorullah Aminyar went missing Saturday after a trip to a mall . The three were reported missing by base security late Saturday and were last seen at a Cape Cod mall in Hyannis . Authorities said they posed no threat to the public . Shelbe Benson-Fuller , regional press officer at U.S. Customs and Border Protection , said the agency was notified by the Canadian Border Services Agency when the men were taken into custody . Canadian officials declined to confirm if the three officers were seeking asylum . Arash , Askarzada and Aminyar arrived in the United States on September 11 for the annual Exercise Regional Cooperation and were quartered at Joint Base Cape Cod , the Massachusetts National Guard said . Their disappearance comes in the wake of an incident earlier this month when two Afghan police officers training with the DEA went missing for six days . Mohd Naweed Samimi , 24 , and Mohammad Yasin Ataye , 22 , were training in Quantico , Virginia , and went missing on September 13 . They were later found on September 18 in Buffalo , New York , according to DEA spokesman Rusty Payne . The men , who Payne said were monitored by escorts at all times , never posed any threat or danger . They wanted to stay in the United States , but authorities found them and sent them home . In both cases , the Afghan attendees at the training sessions were cleared and given visas by the State Department . A source familiar with the process told CNN that officers are usually handpicked and vetted , including a complete background check , possible polygraph and interviews to determine whether they are a flight risk . The source says that the three officers did not break the law . The Massachusetts State Police concurred . The Exercise Regional Cooperation , in which the three soldiers training in Cape Cod were participating , included troops from six nations . Despite their disappearance , the guard said the exercise has continued . The purpose of the exercise is to train participating nations in `` stability operations '' and `` operations conducted during United Nations mandated peacekeeping operations , '' according to the guard . Roughly a dozen Afghan soldiers are still participating . The Regional Cooperation exercise has been conducted annually since 2004 , according to the Massachusetts National Guard . Tajikistan is the lead nation for conducting the exercise this year . The last exercise was held in 2013 and led by the Republic of Kazakhstan 's Ministry of Defense . Gen. Zahir Azimi , a spokesman for the Afghan Defense Ministry , told CNN that the ministry is investigating both incidents . CNN 's Dave Alsup and Mary Kay Mallonee contributed to this report .
NEW : This means the product will ship as received by the manufacturer, sealed, with all advertised components, and with the manufacturer warranty. NEW : They are now being questioned by federal authorities . This is the second incident in which Afghan soldiers went missing in the United States .