OPP say they will release details on Monday on an investigation into provincial government ministries and outside vendors. (CBC)

Ontario Provincial Police say they will release information Monday surrounding the criminal investigation into "irregular financial transactions" involving provincial government ministries and outside vendors.

Officers from the OPP raided several ministries Thursday as part of their probe into these activities.

Police are being tight-lipped on the investigation, and wouldn't expand on the allegations or say whether charges are pending.

An OPP spokesperson said officers will need a lengthy amount of time in order to figure out the scope of the investigation.

"If the evidence proves that charges should be laid then charges will be laid, but at this point we really don't know what's happening," said Supt. Angie Howe.

On Saturday, a senior government source said the investigation did not involve elected officials or political staff.

"No politician or political staff is involved," said the government source who had been briefed on the investigation. The source also said they believed police were looking into more than one ministry.

OPP media officials have said the force's anti-racket branch is conducting the investigation.

The raid took place around a group of government buildings known as the Macdonald Block which is near Queen's Park in downtown Toronto. The Macdonald Block includes several Ontario government ministries and offices such Energy and Infrastructure, Education, Consumer Services among others.

The Ontario Realty Corporation also has its offices in the complex.