Israeli forces launched a fresh deployment in the central Gaza Strip in the early hours of Thursday, the Israel Defence Forces (IDF) announced.
The announcement referred to "a precise, intelligence-based operation to eliminate terrorist operatives and strike terrorist infrastructure in central Gaza."
Israeli combat jets had struck targets above and below the ground before the IDF ground forces moved in, it added.
The IDF said that its troops had "identified an armed terrorist who exited a terror tunnel shaft adjacent to IDF troops and entered a military structure." A combat jet targeted him as he approached the IDF troops.
Several rocket launchers ramps had been found, and the Israeli navy had fired on several targets in the area, it said.
Emergency workers in the area reported that at least five Palestinians had died in a residential block in the Nuseirat Camp for refugees, which lies south-west of Gaza City.
According to the Hamas-controlled health authorities, 33,545 people have been killed in the Gaza Strip since the start of the war triggered by the Hamas-led attacks on Israel more than six months ago. More than 76,000 Palestinians have been injured. The numbers do not distinguish between combatants and civilians.
In the attack by Hamas and other Palestinian militants on the Israeli border area on October 7, more than 1,200 people were killed and over 250 people were abducted to the Gaza Strip.
Earlier this week, the IDF withdrew the bulk of its forces from parts of southern Gaza. Prime Minister Benjamin Netanyahu nevertheless insists that a ground assault on the remaining intact Hamas forces in the border city of Rafah is imminent, despite international calls for it to be called off.
