Sheffield Hallam MP Jared O’Mara has reportedly been arrested on suspicion of fraud.
According to the Mirror, police arrested the MP a week ago, at the same time as his office manager, Gareth Arnold, who was arrested on suspicion of conspiracy to commit fraud.
It is said Arnold had contacted police in July over concerns about parliamentary expense claims made by O’Mara.
It is thought that police raided the MP’s office and removed documents and computers for investigation last Friday.
O’Mara and Arnold were released on Saturday pending further investigation.
The MP confirmed earlier this year that he will resign in September, which will spark a by-election in the constituency.
The 37-year-old won the seat from the former deputy prime minister Nick Clegg in 2017.
Originally a Labour MP, O’Mara was suspended from the party over a series of sexist and offensive comments he had previously made.
He later resigned from the party but continued to serve as an independent.
HuffPost UK has contacted South Yorkshire police for comment.