Immigration Department secretary Michael Pezzullo told a Senate committee late Monday that the Vietnamese men, women and children were intercepted by an Australian border security vessel on March 20 and the asylum seekers were returned to the Vietnamese port of Vung Tau on April 18.
Maj. Gen. Andrew Bottrell said their refugee claims were rejected after individual interviews that lasted between 40 minutes and 2 hours.
Pezzullo said Australia had met its obligations under the United Nations Refugee Convention.