CAIRO, Jan. 28 (Xinhua) -- An Egyptian court reduced on Sunday the jail term of ousted Islamist president's son from three years to one month after his appeal in a case related to his alleged penknife possession without license, official MENA news agency reported.

Osama, son of former President Mohamed Morsi who was ousted by the military in July 2013 in response to mass protests, was sentenced in October last year to three years in prison over the accusation.

The young man was arrested in August 2013 as per a prosecution order in a case related to the dispersal of a pro-Morsi sit-in in Cairo where he was said to have had two penknives in his handbag.

Morsi's Muslim Brotherhood group was gradually blacklisted as a terrorist organization after his removal, and later security crackdown on pro-Morsi sit-ins left hundreds dead and thousands in custody.

Most Muslim Brotherhood leaders, members and supporters, including Morsi and the group's top chief Mohamed Badie, are currently in custody and many of them received appealable death sentences and life imprisonments over various charges varying from inciting violence and murder to espionage and jailbreak.

Morsi is currently serving a 20-year prison sentence over inciting deadly clashes between his supporters and opponents in late 2012 and a 25-year jail term over leaking classified documents to Qatar.

Since Morsi's removal, Egypt has been facing a wave of terrorist attacks that killed hundreds of policemen and soldiers, as well as civilians, with most of them claimed by a Sinai-based militant group loyal to the Islamic State regional terrorist group.