Hamas used more than 6,000 tons of concrete and 1,800 tons of steel for the

Hamas used more than 6,000 tons of concrete and 1,800 tons of steel for the hundreds of kilometers of tunnels beneath the Gaza Strip, the IDF says, citing new intelligence.

The IDF says information recovered by troops in Gaza, along with the hundreds of underground passages that have been investigated so far, indicate that Hamas invested tens of millions of dollars in its tunnels project.

"The Hamas terror organization chose to invest these precious resources in building a terror infrastructure used to harm Israeli citizens and IDF forces, while cynically exploiting the civilian population in the Gaza Strip," the IDF says.

Amid the ground operation in Gaza, the IDF has been operating to demolish Hamas's main tunnel networks.