Egyptian prison authorities executed Thursday morning Adel Habara, a Sinai militant who was convicted of murder in relation with terrorist attacks that killed dozens of Egypt's security personnel.

On Wednesday evening, Egypt's president Abdel-Fattah El-Sisi ratified Habara's death warrant according to the law.

Habara was handed final death sentences in two cases for his involvement in terrorist attacks against Egyptian security personnel.

On Monday, Egypt's Court of Cassation upheld the second death sentence against Habara for killing a police detective in Sharqiya governorate in 2012.

The same court rejected Habara's final appeal against the other death sentence he'd received for plotting the execution-style killing of 25 soldiers in an ambush in North Sinai in August 2013, known as the "Second Rafah Massacre."

Habara was arrested in September 2013 and first stood for trial in November that year.