MENA news agency said that Omar Abul-Magd was arrested late yesterday in Qena province for allegedly insulting Gen. Abdel-Fattah el-Sissi, who led the popularly-backed coup against President Mohammed Morsi.
Since Morsi's ouster, authorities have cracked down on critics of the powerful military.
Earlier this week, a military court ordered five pro-Morsi protesters to serve up to three years in prison for chanting against the army. Three were tried in absentia.