While The Australian and The Sydney Morning Herald said two Indian spies were booted out, the Australian Broadcasting Corporation did not mention any number.
Howard said the introduction of the new border security system had been accelerated by the recent link of Australia to the UK bombing attempts.
Cricket Australia said an independent security assessment confirmed there is a risk of terrorism in Bangladesh targeting Australian nationals.
The plotters are believed to have included six men and one woman, all in their 20s, who allegedly planned to plant bombs and use knives and firearms to launch a "multi-node" attack at Federation Square, Flinders Street Station and St Paul's Cathedral.