An explosion in the Gaza Strip killed five Hamas gunmen on Saturday, Palestinian officials and residents said, adding the cause of the blast was unclear.
An Israeli military spokeswoman said she had no information about the incident.
Reuters television captured a pillar of smoke rising above the village of Zawayda near the coast of Gaza, far from the border with Israel where tensions have escalated in recent weeks.
A statement from the Palestinian Islamist group’s armed wing called the incident a “deplorable Zionist crime” perpetrated against its fighters.
“During a complicated security and intelligence operation conducted by Qassam Brigades to investigate a serious and a grave security incident conducted by the Zionist enemy against Palestinian resistance, a deplorable crime took place against our Mujahideen in the area of Zawayda in central Gaza Strip,” it said.
The Israeli military denied involvement in the Gaza explosion.
“The IDF (Israel Defence Force) is not involved in this incident in any way,” a military spokesman said.
Deadly explosions in Gaza have also been caused by internal Palestinian fighting or by unintentional mishaps among militant groups.
The Gaza Strip is controlled by Hamas.