Rosmah Mansor, the wife of former prime minister Najib Abdul Razak, was today arrested by the MACC in relation to a government solar power project.

"The MACC arrested Rosmah at 1.45pm after she presented herself to facilitate in the completion of the investigation into the solar case at 1.40pm," it said in a statement.

The MACC said Rosmah was subsequently released on bail, but will be charged tomorrow.