The investigation into the failed British terror plot is widening.
The latest arrest came Monday in Australia, where authorities captured 27-year-old Muhammad Haneef as he was trying to board a flight at Brisbane Airport.
Haneef is of Indian descent and is on staff at an Australian hospital. He had previously worked in Liverpool, England. He's been taken into custody and questioning is underway.
The police are being assisted in their investigation by the landlord at an apartment where Haneef lived, who called the suspect a model tenant and "a quiet guy."
Like others in the plot, including a Jordanian and an Iraqi, Haneef is a well-educated doctor. ABC News learned this morning that a fourth suspect arrested in Liverpool was also a doctor, and that all eight suspects in custody worked for British medical services.
The suspect nabbed in Australia is cooperating with police, but those in England are said to be refusing to answer police questions.
Two men were arrested in Blackburn for suspicion of offenses under the Terrorism Act of 2000, but police say it is too early to know if the arrests are linked to the London and Glasgow incidents.
In other security alerts across London, Heathrow Airport's terminal four was evacuated and all flights grounded due to a suspect package, while earlier in the day Hammersmith tube station was evacuated and another suspect package was detonated in a controlled explosion.
As British police find more evidence, they're taking few chances. This morning they carried out controlled explosions on a car outside a Glasgow mosque, which investigators said was linked to the suspects.