France, April 15 -- Financial investigators went to the presidential palace in the morning, but were not allowed to enter, the national financial prosecutor Pascal Prache said.

They were told that Article 67 of the constitution makes premises linked to the presidency "inviolable", Prache said in a statement.

The Elysee said documents requested by investigators would be sent on demand, as is usually done with judicial authorities.

The searches were ordered by two investigating judges as part of a formal probe led by Paris's financial crimes unit, according to a judicial source cited in the French media.

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