Peter Clarke, the head of Scotland Yard's anti-terrorist branch, said the network involved was large and global.
And US Homeland Security Secretary Michael Chertoff said the plot was "in some respects suggestive of al-Qaeda".
Security chiefs, who had had the group under surveillance for some time, said they were close to putting their plan - which police said would have caused "mass murder on an unimaginable scale" - into action.
Sources in the UK have confirmed that they believe an attack may have been imminent - possibly in the next few days. -----------------------------------------------------------------------------------------
The security chiefs, who had had the group under sruveillance for some time, said ....
Is it correct to write 'had had' in the above? Is it past perfect tense?
If you just wrote 'The security chiefs, who had the group under sruveillance for some time, said .... ', is it incorrect?
Top answer
Hi, The security chiefs, who had had the group under sruveillance for some time, said .... Is it correct to write 'had had' in the above? Yes, it is.
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