World Bulletin/News Desk

Four Palestinians were injured Friday in an explosion at a training site south of the Gaza Strip, a medical source said.

"The four were injured when a blast took place at a training site of Palestinian resistance groups," Health Ministry spokesman Ashraf al-Qodra told Anadolu Agency.

It remains unclear what had caused the blast.

Eyewitnesses said that the training site belongs to Palestinian resistance group Hamas in the southern city of Khan Younis.

There was no comment from Palestinian groups on the explosion.