Updated

A presidential historian charged in a conspiracy to steal documents from archives in several states will remain in federal custody while authorities search his New York City apartment again.

Barry Landau's attorney says a hearing on Landau's release will be postponed until Thursday while federal authorities return to his apartment.

Prosecutor James Warwick says investigators hope to gather more information to present to the judge considering Landau's release. He says prosecutors are looking at other charges and are concerned Landau may destroy evidence if he is released.

The 63-year-old Landau and his 24-year-old assistant, Jason Savedoff (SA-veh-dof), are charged with taking documents from the Maryland Historical Society and conspiring to take documents from other archives. Savedoff was released to his mother on $250,000 bail last week.