WASHINGTON -- Top executives from a bankrupt California solar energy company have declined to testify before a congressional hearing investigating their half-billion dollar government loan.

Solyndra Inc. CEO Brian Harrison and the company's chief financial officer, Bill Stover, both invoked their Fifth Amendment right to decline to testify to avoid self-incrimination.

Harrison told the House Energy and Commerce Committee Friday: "On advice of counsel, I respectfully decline to answer any questions."

Stover did the same.

Lawmakers from both parties said they were disappointed, but said that silence from the two executives would not stop them from pursuing their investigation into a $528 million loan Solyndra Inc. received from the Energy Department in 2009.