Eight people have been detained following attempted car bombings at Glasgow Airport and in central London.
Police have also been searching a number of homes as the UK remains on high alert over the possibility of further attacks.
FRIDAY 6 JULY: COMPUTERS SEIZED
Police in Australia seized new evidence and questioned five more migrant doctors.
There were no arrests but computers and other materials were taken from four Western Australian hospitals - two in Perth and two in the Outback mining town of Kalgoorlie.
Four doctors were questioned and subsequently released in Western Australia. Another has been questioned in New South Wales.
THURSDAY 5 JULY: AUSTRALIAN SUSPECT
A British counter-terrorism expert arrived in Brisbane to question Dr Mohammed Haneef.
Meanwhile, Australian authorities used the country's tough new anti-terror laws to apply for permission to extend his detention for a further 96 hours.
In the UK, police searched an address in Cambridge.
WEDNESDAY 4 JULY: TERROR THREAT REDUCED
The terror threat level was reduced from critical to severe.
Home Secretary Jacqui Smith said there was no intelligence to suggest that an attack was imminent, but there remained a serious and real threat.
Prime Minister Gordon Brown announced that an immediate review of NHS recruitment would be carried out following the attempted bomb attacks in London and Glasgow.
Background checks on skilled migrant workers would be expanded, he said in his first prime minister's questions.
TUESDAY 3 JULY: SECURITY ALERTS
Passengers at Heathrow Airport's Terminal 4 were left facing lengthy delays after a security alert was sparked by a suspect bag.
Hammersmith station was cordoned off for a controlled explosion
In Glasgow, three controlled explosions were carried out on a car outside the Forth Street mosque in Pollokshields.
Another took place in Hammersmith, west London, where police investigated three fire extinguishers left outside an Underground station.
The three suspects arrested in Scotland were moved to London.
Late on Tuesday night, a second doctor being questioned by police in Australia was released without charge.
MONDAY 2 JULY: DOCTORS AMONG SUSPECTS
A man was detained at Brisbane airport while trying to board a plane to India, after Australian police acted on information from UK authorities.
Reports suggested he was Dr Mohammed Haneef, 27. A second doctor in Australia was also being interviewed.
At the Royal Alexandra Hospital in Paisley, west of Glasgow, accommodation was cordoned off and controlled explosions carried out to help police examine a vehicle in the grounds.
SUNDAY 1 JULY: ARRESTS AND SEARCHES
Two men, aged 28 and 25, were arrested in Paisley. Officers said the men were not believed to be of British origin. Reports later suggested they were medical students working at the Royal Alexandra.
A 26-year-old man - later named as Sabeel Ahmed - was arrested in Liverpool. He was said to be a doctor who has worked at Warrington and Halton hospital - was arrested close to Lime Street station after police stopped a car.
He was later named as Sabeel Ahmed and is the brother of Kafeel Ahmed, the suspect who is in hospital in Glasgow after suffering burns.
Elsewhere in the city, two addresses were searched.
Homes were searched in Houston, Renfrewshire, a few miles from Glasgow airport.
A search was also under way at the Newcastle-under-Lyme home of Dr Mohammed Asha, the doctor who was arrested on the M6 on Saturday.
Police carried out a controlled explosion at the Royal Alexandra. Officers said they were investigating a car believed to have been connected to the Glasgow airport attack.
SATURDAY 30 JUNE: BURNING CAR DRIVEN AT AIRPORT
A burning car loaded with gas cylinders was driven at the main terminal building at Glasgow's international airport at 1515 BST.
Two men were arrested at the scene. One of the men, later named as Kafeel Ahmed, had serious burns and was taken to hospital, where he is in a critical condition.
The other was later named as Iraqi doctor Bilal Abdullah.
The attack was linked to the failed car bombings in London, police said.
At about 2115 BST police arrested a 26-year-old-man and a 27-year-old woman on the M6 near Sandbach in Cheshire.
The man was later named as Dr Mohammed Asha. It is thought that the woman is his wife.
Dr Asha, who qualified in Jordan, worked as a junior doctor at the Royal Shrewsbury Hospital and the Princess Royal Hospital in Telford.
FRIDAY 29 JUNE: FAILED CAR BOMB ATTACKS IN LONDON
Two Mercedes containing petrol, gas cylinders and nails failed to explode in central London in the early hours of Friday morning.
One of two car bombs in London was left at the Tiger Tiger club
One was left outside the Tiger Tiger club on Haymarket. The bomb was defused after police were alerted by an ambulance crew who spotted smoke in the car.
A second car containing a bomb was towed from nearby Cockspur Street, where it had been parked illegally.
It was taken to a car compound on Park Lane, where it was later found to contain a similar device.