At least three physicians and possibly more are among the eight people arrested so far in connection with two British terror incidents, with more arrests expected.

Three suspects were taken into custody on Monday to add to the five previously arrested.

Two men, aged 25 and 28, were detained under the Prevention of Terrorism Act, Strathclyde police said in Scotland.

A third person was arrested. Authorities would only say the suspect is male and had been detained at an "undisclosed location." Australian officials later reported that a 27-year-old man had been detained while trying to leave that country. That person has been identified as a foreign doctor, born in India but recruited to Australia from Liverpool, England.

At least two others in Britain have been identified as doctors.

British authorities have searched at least 19 locations in what they describe as a fast-moving investigation.

U.K. police believe there is a link between the foiled car bomb plot in London and the fiery attack on Glasgow's airport.

While police have not confirmed it officially, it is strongly believed all of the suspects were born outside the U.K. and have possible ties to al Qaeda. The militants who carried out the July 7, 2005 bombings of London's transit system were born in Britain.

A British security official told The Associated Press that Pakistan and several other countries have been asked to check for possible links with the suspects.

The physician suspects

Information has emerged on the two British suspects who are doctors.

One has been identified as Bilal Abdulla, originally from Iraq came to Britain in 2004 and was working at Glasgow's Royal Alexandra Hospital.

He was one of two men arrested at the Glasgow airport incident and is being held at a high-security police station in Glasgow. Hospital staff say Abdulla was a diabetes specialist.

The other is Mohammed Jamil Abdelqader Asha.

Asha, who worked as a neurologist at North Staffordshire Hospital near Newcastle-under-Lyme, was arrested on a highway in Cheshire on Saturday night. He was arrested with a 27-year-old woman believed to be his wife.

It is believed he came into the U.K. in 2005 and is originally from Jordan.

A doctor at the Royal Alexandra Hospital in Glasgow told AP he recognized Asha as a doctor who kept an office there. The hospital did not confirm that.

Police carried out a controlled explosion on a second car at the hospital site on Monday, having blown the first up on Sunday.

Asha's father in Jordan rejected the notion that his son had militant leanings.
 
"My son is a moderate Muslim and carried out his religious duties, but he never embraced fanaticism," he told The Associated Press.

Little has been released or learned about the other six suspects. However, a report by the Independent newspaper claimed up to five of the eight suspects are physicians, although the report didn't source that information. The paper said the two men arrested Monday in Scotland were also doctors.

U.K. on high alert

Britain continues to remain at its highest terrorism alert level.

Police have flooding London's subway and train stations and tightened security at the Wimbledon tennis tournament. Massive concrete blocks were set in front of the main entrance to guard against any possible attack with a vehicle.

People interviewed on the street accepted the intrusions as a necessary cost and insisted they wouldn't be stopped from living their lives.

"These measures are designed to maximize public safety while minimizing disruption to normal life," Home Secretary Jacqui Smith said Monday in Britain's Parliament.

Smith said the British government has launched a full review of counter-terrorism legislation and will propose a new bill later this year.

"Terrorism is a serious threat to us all. We must ensure our resources, capability and legislation support our common endeavour to defend the shared values of this country from terror," Smith said.

Smith thanked the public for their patience over the weekend.

"The fact that the people have been prepared to go about their lives as normally as possible this weekend sends the strongest message to those who wish to destroy our way of life and our freedoms that we will not be intimidated by terror," Smith said.

The U.S. has also increased security at airports with U.S. marshals travelling on flights to and from Britain.

Travellers are being warned in both the U.K. and the U.S. to expect major delays.

However, the U.S. has not raised its terror alert level, which is currently set at yellow, the second-highest level. The country's Independence Day celebrations take place on Wednesday.

With a report from CTV's Tom Kennedy and files from the Associated Press