LONDON--British police questioned former CNN talk-show host and former U.K. tabloid editor Piers Morgan for a second time on Tuesday as part of a long-running probe of alleged phone hacking by British journalists.

Mr. Morgan's agent, John Ferriter, confirmed his client had met with police but stressed that he had done so voluntarily.

"He was asked to attend an interview, which he did," said Mr. Ferriter. "Nothing has changed."

The Metropolitan Police said in a statement that detectives had interviewed a 50-year-old man under caution as part of Operation Golding, the code name for the force's investigation of alleged phone hacking at titles owned by Mirror Group Newspapers PLC. The police said the man hadn't been arrested.

"No, I wasn't arrested. Sorry to disappoint everyone," said a tweet sent from Mr. Morgan's official Twitter account.

Police have been investigating phone hacking generally for nearly nine years, but intensified their efforts in 2011 amid a series of wide-ranging public inquiries into the ethics of newsgathering methods by the British press. Those inquiries, one by lawmakers and another by a senior judge, were initially sparked by revelations that some reporters had unlawfully listened to messages left on the cellphones of celebrities and public figures.

Mr. Morgan, 50 years old, edited the Daily Mirror, a Trinity Mirror title, from 1995 to 2004. Trinity Mirror declined to comment Tuesday.

Police had questioned Mr. Morgan as part of the broader probe in 2013, as previously reported.

In past public statements and interviews, Mr. Morgan has denied illegally intercepting voice mails or having any knowledge that it happened under his editorship at the Mirror.

The disclosure of Mr. Morgan's questioning comes days after British prosecutors dropped charges against nine defendants, including Andy Coulson, the former editor of the now-defunct News Corp tabloid News of the World. The prosecutors' move was a major setback for the wide-ranging investigation of alleged illicit practices at U.K. tabloids that has cost millions of pounds in court fees and police time, but yielded few convictions.

On Friday, jurors in a separate trial also acquitted a former Daily Mirror reporter and two reporters from the News Corp title The Sun accused of conspiring to commit misconduct in public office, the charge leveled at most reporters accused of bribing government employees for stories.

News Corp, which owns the publisher of The Wall Street Journal, declined to comment Tuesday.

Mr. Morgan played a bit part in a separate, high-profile trial of Mr. Coulson and another former News of the World editor, Rebekah Brooks, last year.

While the eight-month court battle captured the public imagination and shone a spotlight on practices at several British newspapers, prosecutors were left with little to show for the effort.

Ms. Brooks, who pleaded not guilty, was acquitted of all charges, including phone hacking, bribery and two counts of obstruction of justice. Mr. Coulson was found guilty of one count of conspiring to intercept phone voice mails between 2002 and 2006 and sentenced to 18 months in prison. He left jail late last year after serving five months of his term.

Write to Alexis Flynn at alexis.flynn@wsj.com

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