Australian authorities have intercepted an asylum seeker boat carrying 105 passengers northwest of Cocos Islands.
The boat was first detected on Sunday by an RAAF maritime patrol aircraft before the ACV Triton, under the control of Border Protection Command, was sent to the area.
The passengers will be transferred to the Cocos (Keeling) Islands for basic health and security checks, before being sent to Christmas Island.
The federal government has warned that people arriving by boat without a visa after August 13 run the risk of being sent to processing centres on Nauru or Manus Island in Papua New Guinea.
Opposition justice, customs and border protection spokesman Michael Keenan said five boats, carrying more than 300 people, had arrived in Australia in the past 48 hours.
The numbers would continue to grow under the Gillard government unless a tougher stance on border protection was taken, he said.