Scott Mills was questioned over sexual assault allegations against a teenage boy in 2016.
The Metropolitan Police told the BBC that a man who was in his 40s at the time was investigated over allegations 'reported to have taken place between 1997 and 2000'.
"In December 2016, the Met began an investigation following a referral from another police force," a spokesperson said. "The investigation related to allegations of serious sexual offences against a teenage boy."
"As part of these enquiries, a man who was in his 40s at the time of the interview, was questioned by police under caution in July 2018," the force added.
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"A full file of evidence was submitted to the Crown Prosecution Service, who determined the evidential threshold had not been met to bring charges.
"Following this advice, the investigation was closed in May 2019."
The broadcaster has not given any further details surrounding the allegations, and it has not been made clear if the investigation and the accusations were a factor in his sacking.
The BBC confirmed in a statement on Monday (30 March) that Mills, 53, has been sacked from Radio 2.
"While we do not comment on matters relating to individuals, we can confirm Scott Mills is no longer contracted to work with the BBC," it said.
The Mirror was first to report that it 'understands the allegation relates to a historic relationship'.
Director of Music, Lorna Clarke, was said to have informed Mills' colleagues of the sacking via email.
"I wanted to personally let you know that Scott Mills has left the Breakfast show, and the BBC," it reportedly read.
"I know that this news will be sudden and unexpected, and therefore must come as a shock.
"Not least as so many of us have worked with Scott over a great many years, across a broad range of our programmes on R1, 5Live, R2 and TV.
"I felt it was important to share this news with you at the earliest opportunity."
It continued: "Of course, it will also come as a shock to our audience and loyal breakfast show listeners too. I will update everyone with more information on plans for the show when I’m able to.
"While I appreciate many of you will have questions, I hope you can understand that I am not going to be saying anything further now."
Mills presented BBC Radio 1 from 2004 to 2022 and then BBC Radio 2 until his recent dismissal.
He earned between £355,000 and £359,999, according to a pay report for 2024 to 2025.
LADbible Group has contacted Scott Mills' representatives for comment.
Anish Vij