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LONDON — British authorities said Thursday they thwarted a terrorist plot to simultaneously blow up several aircraft heading to the U.S. using explosives smuggled in hand luggage, averting what police described as ''mass murder on an
unimaginable scale.''

Pakistani intelligence helped British security agencies crack the plot, and has arrested two or three suspects in recent days, officials said Thursday.

“Pakistan played a very important role in uncovering and breaking this international terrorist network,” said Foreign Ministry spokesman Tasnim Aslam.

“Cooperation in this particular case was spread over a period of time. There were some arrests in Pakistan which were coordinated with arrests in the U.K.,” she said.
She declined to give details about the arrests, including the number of suspects, their identities or when they were arrested.

But a senior government official, speaking on condition of anonymity because he wasn’t authorized to comment on the matter, said “two or three local people” suspected in the plot were arrested a few days ago in Lahore and Karachi.

British police arrested 21 people, saying they were confident they captured the main suspects in what U.S. officials said had the earmarks of an al-Qaida plot.
Officials raised security to its highest level in Britain — suggesting a terrorist attack might be imminent — and banned carry-on luggage on all flights. Huge crowds backed up at security barriers at London’s Heathrow airport as officials searching for explosives barred nearly every form of liquid outside of baby formula.

U.S. Homeland Security Secretary Michael Chertoff said the terrorists planned to use liquid explosives disguised as beverages and other common products and set them off with detonators disguised as electronic devices.

The extreme measures at a major international aviation hub sent ripples throughout the world. Heathrow was closed to most flights from Europe, and British Airways canceled all its flights between the airport and points in Britain, Europe and Libya. Numerous flights from U.S. cities to Britain were canceled.

Washington raised its threat alert to its highest level for commercial flights from Britain to the United States amid fears the plot had not been completely crushed.

The alert for all flights coming or going from the United States was also raised slightly.

Two U.S. counterterrorism officials said the terrorists had targeted United Airlines, American Airlines and Continental Airlines. They spoke on condition of anonymity because of the sensitivity of the case.

A U.S. intelligence official said the plotters had hoped to target flights to major airports in New York, Washington and California.

British Home Secretary John Reid said the 21 people were arrested in London, its suburbs and Birmingham following a lengthy investigation, including the alleged “main players” in the plot. Searches continued in a number of locations.

The British Broadcasting Corp. said police were evacuating homes in High Wycombe, a town 30 miles northwest of London, near one of the houses being searched. Police refused to confirm the report or to discuss any details of the searches.

The suspects were “homegrown,” though it was not immediately clear if they were all British citizens, said a police official who spoke on condition of anonymity because of the sensitivity of the case. Police were working closely with the South Asian community, the official said.

The official said the plotters intended to simultaneously target multiple planes bound for the United States.

“We think this was an extraordinarily serious plot and we are confident that we’ve prevented an attempt to commit mass murder on an unimaginable scale,” Deputy Police Commissioner Paul Stephenson said.

Prime Minister Tony Blair, vacationing in the Caribbean, briefed President Bush on the situation overnight. Blair issued a statement praising the cooperation between the two countries, saying it “underlines the threat we face and our determination to counter it.”

White House spokesman Tony Snow said Bush also had been briefed by his aides while at his ranch in Crawford, Texas, where he has been on vacation.

“We do believe the plot involved flights from the U.K. to the U.S. and was a direct threat to the United States,” Snow said.
While Snow called the plot a serious threat, he assured Americans that “it is safe to travel.”

Chertoff, the homeland security chief, said the plot had the hallmarks of an operation planned by al-Qaida, the terrorist group behind the Sept. 11 attack on the United States.

“It was sophisticated, it had a lot of members and it was international in scope. It was in some respects suggestive of an al-Qaida plot,” Chertoff said, but he cautioned it was too early in the investigation to reach any conclusions.

It is the first time the red alert level in the Homeland Security warning system has been invoked, although there have been brief periods in the past when the orange level was applied. Homeland Security defines the red alert as designating a “severe risk of terrorist attacks.”

“We believe that these arrests (in London) have significantly disrupted the threat, but we cannot be sure that the threat has been entirely eliminated or the plot completely thwarted,” Chertoff said.

He added, however, there was no indication of current plots within the United States.
Chertoff said the plotters were in the final stages of planning. “We were really getting quite close to the execution phase,” he said, adding that it was unclear if the plot was linked to the upcoming fifth anniversary of the Sept. 11 terror attacks.

A senior U.S. counterterrorism official said authorities believe dozens of people — possibly as many as 50 — were involved in the plot. The official spoke on condition of anonymity because of the sensitivity of the situation.

The plan involved airline passengers hiding masked explosives in carry-on luggage, the official said. “They were not yet sitting on an airplane,” but were very close to traveling, the official said, calling the plot “the real deal.”

Passengers in Britain faced delays as tighter security was hastily enforced at the country’s airports and additional measures were put in place for all flights. Laptop computers, mobile phones, iPods, and remote controls were among the items banned from being carried on board.
Liquids, such as hair care products, were also barred on flights in both Britain and the U.S.

In the mid-1990s, officials foiled a plan by terrorist mastermind Ramzi Youssef to blow up 12 Western jetliners simultaneously over the Pacific. The alleged plot involved improvised bombs using liquid hidden in contact lens solution containers.
Huge lines formed at ticket counters and behind security barriers at Heathrow and other airports in Britain.

Ed Lappen, 55, a businessman from Boston, who was traveling with his wife and daughter to Russia, found himself unable to travel further. “We’re safe, we’re OK,” he said at Heathrow. “Now my daughter is going to get a shopping trip in London.”

Hannah Pillinger, 24, seemed less concerned by the announcement. “Eight hours without an iPod, that’s the most inconvenient thing,” she said, waiting at the Manchester airport.

Most European carriers canceled flights to Heathrow because of the massive delays created after authorities enforced strict new regulations banning most hand baggage.

Tony Douglas, Heathrow’s managing director, said the airport hoped to resume normal operations Friday, but passengers would still face delays and a ban on cabin baggage “for the foreseeable future.”

“At this point in time it is unclear how long these restrictions will remain in place,” he said.

Security also was stepped up at train stations serving airports across Britain, said British Transport Police spokeswoman Jan O’Neill. At London’s Victoria Station, police patrolled platforms with bomb-sniffing dogs as passengers boarded trains carrying clear plastic bags.

Margaret Gavin, 67, waiting to board a train, said she wasn’t scared. “Why should I change my life because some idiots want to blow something up?” she said.

Heathrow’s block on incoming traffic applied to flights of three hours or less, affecting most of the incoming traffic from Europe, an airport spokesman said on condition of anonymity in line with airport policy.

Officials at Frankfurt’s airport, Europe’s second-busiest, Schiphol in Amsterdam and Charles De Gaulle in Paris said Heathrow-bound planes could instead land at their airports if they needed to.

London’s Heathrow airport was the departure point for a devastating terrorist attack on a Pan Am airplane on Dec. 21, 1988. The blast over Lockerbie, Scotland, killed all 259 people aboard Pan Am Flight 103 and 11 people on the ground.
The explosive was hidden in a portable radio secreted in checked baggage.

Associated Press writers Lara Jakes Jordan in Washington and Matt Moore in Frankfurt, Germany, contributed to this report.