WINNIPEG -- A former adviser to Manitoba Premier Greg Selinger is being investigated by her employer and the Opposition Tories are demanding details.

Heather Grant-Jury, a longtime labour activist who worked for five months as a top adviser in the premier's office, has been dropped from the board of a Crown agency, a provincial NDP election committee and her decade-long job at a training centre run by the United Food and Commercial Workers union.

No one has released details of what sparked the actions. A government source, speaking on condition of anonymity, told The Canadian Press on Wednesday that concerns came to light late last year that money may have been misused at the training centre, where Grant-Jury was the director.

"Heather Grant-Jury is no longer employed by the UFCW Local 832 training centre. We are conducting an internal investigation and have no other details to provide at this time," union spokesman Blake Crothers wrote in an email.

The Winnipeg Police Service said it has received a report from the union, but would not comment further.

The premier's office indicated the matter only came to light recently and has nothing to do with Grant-Jury's time as Selinger's principal secretary from November 2014 to April 2015.

"The chief of staff was contacted by phone by the president of UFCW about a potential internal human resources matter on December 30, 2015," Selinger's communications director, Naline Rampersad, wrote in an email.

"When it was confirmed the following day ... that the UFCW believed there to be a serious matter that would require further steps to be taken, the chief of staff informed the premier and, at his direction, requested Ms. Grant-Jury's immediate resignation from the (Manitoba Public Insurance) board."

Attempts to reach Grant-Jury via telephone and social media were unsuccessful. She has not been charged with any offence and faces no civil legal action.

The Opposition Progressive Conservatives are calling on Selinger to provide information on how long he has known of the concerns. Tory house leader Kelvin Goertzen also said Selinger must ensure that taxpayer money was not put at risk.

Budget documents show the training centre has received more than $500,000 in recent years for worker education and career coaching.

"We need to know what steps Mr. Selinger has taken to ensure that taxpayers' dollars were not misused," Goertzen said.

The union said all government funding has been accounted for, and the training centre was recently audited by the federal government for money it had received from Ottawa.

"All the funds that were given to us by government agencies were properly used and accounted for," Crothers said.

Selinger said Wednesday government officials had already checked.

"The (union) has assured us there were no government resources involved in their investigation, and our officials in government have confirmed that."

Manitoba faces a provincial election April 19 at a time when Selinger is still recovering from a leadership crisis. Five of his most senior cabinet ministers publicly questioned his ability in November 2014 and he won a March leadership ballot by 33 votes.

Selinger parted ways with most of his advisers during that time and Grant-Jury was among the replacements brought in temporarily. She returned to her union job last April, but was appointed by Selinger's cabinet to the Manitoba Public Insurance board of directors in November -- a part-time job that was to pay $7,500 a year.