Police have arrested five people over allegations of fraud in elections to Angela Rayner's local council.
Four men and a woman - aged between 23 and 47 - have been arrested as part of an investigation into the process of how candidates were put forward in Tameside.
The news from Greater Manchester Police came after Labour denied accusations that fake independent candidates had been planted in two council wards, in a bid to split the support of opponents.
A spokesman for Ms Rayner, who represents the Ashton-under-Lyne constituency, previously dismissed the idea she was involved as 'obvious nonsense'.
They told the Tameside Correspondent that she had 'no input or involvement in the selection of candidates for any of the wards within her constituency'.
Police have arrested five people over allegations of fraud in elections to Angela Rayner's local council. A spokesman for Ms Rayner, who represents the Ashton-under-Lyne constituency, previously dismissed the idea she was involved as 'obvious nonsense'
Reform ended up securing 18 seats in the contest on May 7, while Labour was reduced to just one
The force said it had received reports of concerns about candidates in the St Peter's ward of Tameside council in the days before and after the election on May 7.
A spokesman said: 'Following initial inquiries last week, we have launched a full investigation into the allegations.
'The work is specifically investigating the process of how candidates were put forward and represented in the ward, and if this adhered to the relevant legislation and electoral procedures.'
Reform ended up securing 18 seats in the contest, while Labour was reduced to just one.
A Labour spokesman told the Manchester Evening News at the end of last month: 'These allegations are completely baseless and false.
'Our Labour team are focussed on what really matters to residents – delivering for residents and protecting services, not playing political games.'
The party is said to have reported 'misinformation' to the police and Electoral Commission.