A Guardian Journalist has been interviewed under caution by police investigating phone-hacking scandal at the News of the World.
37 year old special investigations correspondent Amelia Hill was quizzed by officers last week.
The interview is believed to relate the arrest of a detective suspected of leaking sensitive information to the Guardian.
It is believed that the senior reporter was close to the Scotland Yard detective who works on Operation Weeting.
Hill has written a series of scoops for the Guardian about the NoTW hacking scandal.
She broke the Guardian's Milly Dowler story which revealed that a private investigators working for the NoTW hacked the the murdered schoolgirl's voicemail.
A Guardian News and Media spokeswoman said in a statement: "We can confirm Amelia Hill has been questioned in connection with an investigation into alleged leaks.
“On a broader point, journalists would no doubt be concerned if the police sought to criminalise conversations between off-record sources and reporters.”
So far the hacking scandal has led to the arrest of 16 people, including Prime Minister David Cameron's spin doctor Andy Coulson
