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Leveson inquiry: John Twomey, James Murray, Jeremy Lawton - live Leveson inquiry: John Twomey, James Murray, Jeremy Lawton - live
(40 minutes later)
10.15am: In December 2006 Harrison was part of a Serious Organised Crime Agency (SOCA) team working on the hunt for the Ipswich serial killer who murdered five prostitutes. 10.55am: Leveson puts it to Twomey that if vital information is passed on to a journalist, the police "have lost control" because the journalist may then decide to publish on public interest grounds.
Twomey says there would be a "careful reflection", there would not be a "rushing into print".
"You would never go ahead with any story that would possibly jeopardise apprehending a criminal … or a prosecution," says Twomey.
10.51am: The inquiry is returning to one of its most frequent themes - police and journalists in the pub.
Twomey explains it is "very unlikely" for informal information to be passed on over the phone – it would normally through a face-to-face meeting, perhaps in a pub.
10.47am: Twomey says a "tighter budget at the Express" means it can't pitch for exclusive pictures and stories as often as other papers.
Relations between police and the media changed over time but noticeably so around the time of the Stephen Lawrence murder when newspapers became more critical of the Met.
10.41am: John Twomey of the Daily Express has the stand.
Since 2009, he has been chairman of the Crime Reporters' Association.
10.33am: Jay has now finished his questioning of Harrison.
At around 15 minutes, that was one of the shortest testimonies of the Leveson inquiry which is expected to come back to the subject of the hunt for the "Suffolk Strangler", Steve Wright.
10.31am: Harrison says police investigations can be hampered by newspapers that deploy professional surveillance operations.
The inquiry hears how murder suspects often return to the scene of the crime, or may commit further offences, but if the suspect knows they are being followed they would behave differently and elude the police.
10.30am: Harrison says the Sunday Mirror had also engaged a team that mounted surveillance.
Its picked the first suspect up and took him to a place where he could be "debriefed".
However, that suspect was not the murderer.
10.17am: During the hunt for the killer, a News of the World surveillance team was deployed to identify who the Soca team were.
The surveillance team followed police vehicles, and parked on the outskirts of Ipswich in the same spot the officers would normally be.
Harrison says it was clear that they were professionals, possibly ex-special forces.
10.15am: In December 2006 Harrison was part of a Serious Organised Crime Agency (Soca) team working on the hunt for the Ipswich serial killer who murdered five prostitutes.
10.08am: The inquiry has begun and the first witness is retired criminal investigator Dave Harrison.10.08am: The inquiry has begun and the first witness is retired criminal investigator Dave Harrison.
Robert Jay QC, counsel to the inquiry, explains that some witnesses are appearing out of order as they can only make certain dates.
9.58am: Welcome to the Leveson inquiry live blog.9.58am: Welcome to the Leveson inquiry live blog.
Today's witnesses are crime correspondents: John Twomey of the Daily Express, James Murray of the Sunday Express and Jeremy Lawton of the Daily Star.Today's witnesses are crime correspondents: John Twomey of the Daily Express, James Murray of the Sunday Express and Jeremy Lawton of the Daily Star.
Twomey is also chairman of the Crime Reporters' Association.Twomey is also chairman of the Crime Reporters' Association.
The fourth witness is Dave Harrison, a retired criminal investigator.The fourth witness is Dave Harrison, a retired criminal investigator.
Please note that comments have been switched off for legal reasons.Please note that comments have been switched off for legal reasons.