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. Last Updated: 07/27/2016

5 Arrested in U.K. Bomb Plot

GLASGOW, Scotland -- Police searched several houses near Glasgow's airport and made a fifth arrest Sunday in connection with an attack on its main terminal and a foiled car bomb plot in London.

Britain's new prime minister warned that it was clear the country was dealing with terrorists associated with al-Qaida.

On Friday, police thwarted a plot to set off a coordinated bomb attack in central London when an ambulance crew spotted smoke coming from a Mercedes rigged with explosives. They found a second explosives-laden Mercedes several hours later.

Then on Saturday, two men rammed a flaming Jeep into the main entrance of Glasgow airport, shattering the glass doors and sparking a raging fire just meters from people lined up at check-in counters on the first day of schoolchildren's summer vacation.

The two men were in police custody Sunday, one of them under guard in the hospital after being engulfed in flames when the Jeep crashed.

Police arrested two others on a major highway in Cheshire, northern England, on Sunday in a joint swoop by officers from London and Birmingham, Scotland Yard said in London, and a fifth suspect was arrested in Liverpool, police there said.

Police said officers were searching a residential area about 12 kilometers west of central Glasgow. In Houston, a small town just outside Glasgow, police cordoned off the area around a two-story house to search it.

"We can confirm as part of the ongoing inquiry into the incidents in Glasgow airport and London, a number of houses in the Renfrewshire area are being searched," police said in a statement.

The two attacks clearly are linked, police and security officials said, noting that all three vehicles contained large amounts of flammable materials -- including gasoline and propane.

Glasgow police chief Willie Rae said a suspicious device was found on a man wrestled to the ground by officers at Glasgow airport and hospitalized in critical condition with severe burns.

Witness John Smeaton said the man shouted, "Allah, Allah" as he was detained.

"There are clearly similarities and we can confirm that this is being treated as a terrorist incident," Rae said.

British media said the man was wearing a suicide belt and that police had found propane propane tanks in the vehicle in Glasgow. But police later said an initial inspection by explosives experts had not found a suicide vest.

Glasgow airport began reopening Sunday, although the airport operator warned that a "large number" of flights would be canceled. Cars were not allowed to drive up to the terminal building.

The crashed jeep remained out front, covered in a blue tarpaulin, and at one point, the line of people waiting to pass through the security cordon stretched for several hundred meters.

Liverpool John Lennon Airport in northwest England, which closed late on Saturday because of a suspicious vehicle, also reopened Sunday.

Officers were reviewing closed-circuit television footage in the search for clues into the foiled bombings.

Detectives said they were keeping an open mind about who the bombers were, but terrorism experts said the signs pointed to a cell linked to or inspired by al-Qaida.