I call on the world to help my son, an aid worker wrongfully imprisoned by Israel | Khalil El Halabi

Mohammad El Halabi has been detained for five years without trial, accused of diverting $50m in aid funds to Hamas

• Khalil El Halabi worked for four decades as an education supervisor in the Gaza Strip for UNRWA

Children around the world have been returning to school classrooms in recent weeks, including here in the Gaza Strip. For my 10-year-old grandson, Faris, the new school year began without his father to take him to school or help him with homework.

His father - my son, Mohammad El Halabi - has not been home with his family for more than five years. Instead, he sits in an Israeli jail on the basis of trumped-up charges.

Khalil El Halabi worked for four decades as an education supervisor in the Gaza Strip for the United Nations Relief and Works Agency for Palestine Refugees in the Near East (UNRWA)