JERUSALEM, May 20 (Xinhua) -- The Israeli military said on Tuesday that it will expand its ground offensive in Gaza and take control of additional territory.

"We will expand our operation, establish operational control over more territory, and clear and dismantle the terrorist infrastructure -- until Hamas is decisively defeated," Israel's military chief Eyal Zamir said in a video statement from Gaza on the fourth day of Operation Gideon's Chariots, Israel's largest ground assault on the enclave in months.

Zamir said Hamas had been "severely weakened" but yet to be defeated.

At least 87 people were killed in Gaza on Tuesday, according to the territory's health authorities, bringing the death toll from Israel's 19-month offensive to 53,573.

The Israeli military said its warplanes struck more than 100 locations in Gaza over the past day. In northern Gaza, targets included militants, a weapons storage site, a military structure used by Islamic Jihad, and underground infrastructure. In the south, the strikes targeted militants, military compounds, and observation posts.

Meanwhile, 93 United Nations trucks carrying humanitarian aid, including flour for bakeries, infant food, medical equipment, and pharmaceuticals, entered Gaza on Tuesday via the Kerem Shalom crossing, according to COGAT, the Israeli Defense Ministry unit responsible for civilian affairs in the occupied Palestinian territories.

However, none of the trucks had reached their intended destinations due to logistical and security challenges, Israel's Haaretz newspaper reported.

Five trucks entered Gaza on Monday, marking the first delivery after an 11-week Israeli blockade on food, medicine, and fuel. Israel said it would permit a limited amount of aid into Gaza due to mounting pressure from its close allies, as UN experts continue to warn of the spread of famine.