A federal prosecutor says the man accused of trying to blow up the district attorney's office in Medford will plead guilty.

Court records say Alan Leroy McVay is to appear Monday in federal court in Medford to change his plea. He's accused of malicious destruction of property by explosive.

Prosecutor Byron Chatfield said Tuesday that McVay will plead guilty. McVay's attorney did not immediately respond to a request for comment.

Investigators said McVay told them he wanted to delay his sentencing on a burglary charge in November and made the device by taping a pipe bomb to a propane tank.

He threw it at a window, but it got hung up on the blinds and didn't get into the office. The pipe bomb exploded, but the propane tank didn't.