Three men were killed Tuesday in an explosion at a resistance training ground in the southern Gaza Strip.

Popular Resistance Committees spokesman Abu Mujahid told Ma'an that three men affiliated with the group were killed in a blast at the Abu Ataya training ground in Tel Sultan, west of Rafah.

It was not immediately clear what caused the explosion but the Israeli military said it was not responsible.

Abu Mujahid identified those killed as Younis Abu An-Naja, Ramzi Abu Harb, and Mahmoud Al-Arqan.

He said a fourth man sustained wounds and was taken to the Abu Yousif An-Najjar Hospital in Rafah.

On Friday, two fighters affiliated with Hamas were killed in an explosion in Khan Younis in the southern Gaza Strip.

On Oct. 20, 13 Palestinians civilians were injured by an explosion of undetermined origin in a Hamas security services building in Tel Sultan.