WASHINGTON (CNN) -- The United States on Thursday raised its terror threat level after British police said they had arrested more than 20 suspects in a major terrorist plot to blow up passenger jets flying between the United Kingdom and the United States.
The foiled plot was "intended to be mass murder on an unimaginable scale," Metropolitan Police Deputy Commissioner Paul Stephenson said.
The intelligence that uncovered the plot "makes very strong links to al Qaeda," a senior U.S. administration official told CNN.
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