Khalid al-Qaisi, 38, died and five others were injured in the blast at the al-Qaisi home in Rafah, the Nasser Salah al-Din Brigades said in a statement. The injured were not named.
The statement said al-Qaisi was killed in action while performing a “jihad mission” in Rafah, but no other details were disclosed.
A medical official, Adham Abu Salmiya, said the charred corpse of an al-Qaisi family member was transferred to Abu Yousef al-Najjar Hospital after the explosion in Rafah, which borders Egypt.
A Ma’an correspondent said parts of the city “literally shook” during the explosion, the cause of which was not immediately clear. An Israeli military spokeswoman denied army involvement.
The PRC said secretary-general Zuhair al-Qaisi, a relative of Khalid, was unharmed.