Assembly Speaker Sheldon Silver turned himself in to federal authorities and is in FBI custody, sources said.

Silver turned himself in to authorities at 8 a.m. this morning.

It is not clear what charges Silver faces.

The Manhattan Democrat has led the chamber since 1994.

But the U.S. attorney’s office has been investigating Silver’s income from a law firm that has done business before the state when it comes to the real estate industry.

U.S. Attorney Preet Bharara’s office took custody of records generated by the Moreland Commission To Investigate Public Corruption after it was shut down by Gov. Andrew Cuomo last year.