GEOFF BENNETT: Israel and Lebanon have agreed to a cease-fire for another three weeks, but, even as that extension was being negotiated, the truce has been unraveling on the ground.

That's with multiple violations by both Israel and the Iran-backed militant group Hezbollah.

Special correspondent Simona Foltyn reports now from Southern Lebanon.

SIMONA FOLTYN: The people of Itid (ph) have returned to bury their dead.

The temporary cease-fire is hanging by a thread, but it has given villagers in Southern Lebanon a brief window to come home and take stock of all that's been lost to Israeli bombs.

Lubna Sleiman mourns her brother, Hassan Sleiman, a civil defense worker.

He is just one of 100 first responders killed by the Israeli military.

LUBNA SLEIMAN, Sister of Israeli Strike Victim (through translator): There's nothing Israel won't target.

They don't spare first responders.

They don't spare children.

He was a medic who was rescuing people who were dying and he was hit.

What is the reason?

They were clearly marked as an ambulance.

SIMONA FOLTYN: Hassan, seen here in the picture to the left, was killed alongside his colleague, Yusuf Ali Atoui (ph).

Israel targeted their ambulance on March 23, but until the cease-fire came into force last week, heavy fighting made it impossible to bury them.

Yusuf's wife, now widow, is pregnant with their first child.

I spoke to her sister, Mariam.

MARIAM HARB, Sister-in-Law of Israeli Strike Victim (through translator): My sister is expecting a baby, her first son.

We are very angry.

Yusuf was moving the injured and evacuating the people of the village.

He was also working as a mechanic.

He had nothing to do with the fighting.

SIMONA FOLTYN: Israel killed more than 2,000 Lebanese during 45 days of war; 18 people, including civilians and Hezbollah fighters, are being laid to rest in this village alone.

The coffins are carried down to the graveyard to the sound of gunfire, an expression of grief, but also defiance.

"We will not accept humiliation," the mourners chant, in an enduring battle cry, as old as Shiite faith itself.

For many here, Hezbollah, what they call the resistance, is waging a righteous struggle against injustice.

MARIAM HARB (through translator): We are the resistance.

We will defend our land until our last breath.

It's impossible that we will back down.

It's about our dignity.

SIMONA FOLTYN: These communities reject their government's decision to hold direct talks with Israel, which demands that Hezbollah be disarmed.

MARIAM HARB (through translator): We can't hand in our weapons because there's no one else to defend us.

If we handed in our weapons and made peace with Israel, we know that we would be humiliated.

This land was never theirs, not in Palestine, not in Lebanon.

SIMONA FOLTYN: Israel has made no sign of withdrawing from Lebanese land.

Following the cease-fire, an IDF spokesperson published a map.

That appears to delineate areas it plans to occupy indefinitely.

The Israeli military has prohibited civilians from returning to dozens of villages south of what it calls a forward defense line.

We drove right up to this new de facto border.

In the village of Hadassah (ph), six miles north of the Israeli border, is as far as the Lebanese army has deployed.

South of here is dangerous, we are told.

South of here, the cease-fire does not apply.

This is the furthest Lebanese army checkpoint to the south.

The Israeli military is stationed just a few miles down that road in the town of Bint Jbeil.

There is an Israeli drone above our heads.

And in the few minutes that we have been here, we have heard several explosions.

The Lebanese army is telling us that these are controlled detonations carried out by the IDF.

So this means that, despite the cease-fire, the Israeli military continues to demolish infrastructure in Lebanon's south.

The same day, just two miles down the road, the IDF killed two Lebanese civilians, as well as veteran Lebanese correspondent Amal Khalil.

Such strikes have sent a chilling message to journalists and civilians to stay away from Israel's forbidden zone.

Youssef Fahad Saleh and his family have little hope to return any time soon.

Their border village of Aita Al-Shaab is once again in Israeli hands.

It's the fourth occupation since he was born.

The only updates he gets are from news reports posted by Israeli media or the IDF.

YOUSSEF FAHAD SALEH, Displaced from Aita Al-Shaab (through translator): Seeing this, of course, causes you heartbreak.

The enemy is there.

They entered and destroyed the land that I grew up on, land I have lived on.

It gives you determination to defend and reclaim your land.

SIMONA FOLTYN: Even towns a bit further north that are under Lebanese control remain practically abandoned.

Only about a third of the population have returned to Jbeil al-Butm, the village chief tells me.

ALI KHALIL, Village Chief, Jbeil al-Butm, Lebanon (through translator): Everything is gone.

There's no electricity.

There's no water, no phone networks.

They hit it during the previous war.

It was repaired.

But during this war, we lost a lot of infrastructure.

SIMONA FOLTYN: People here are scared that Israel might strike anywhere any time.

YOUSSEF BALHAS, Resident of Jbeil al-Butm, Lebanon (through translator): We are sitting here.

We don't know if we should stay or leave.

ALI MOHANNA, Resident of Jbeil al-Butm, Lebanon (through translator): Israel doesn't differentiate between civilians and fighters.

This has really affected people, in addition to the damage that has been inflicted on their houses.

SIMONA FOLTYN: Hezbollah has made it clear it will not accept a one-sided cease-fire.

Responding to repeated Israeli violations, the group has claimed responsibility for 10 attacks on Israeli troops both inside Lebanon and in Northern Israel.

The cease-fire may have been extended, but, for the people of the south, it's a cease-fire only in name.

For the "PBS News Hour," I'm Simona Foltyn in Southern Lebanon.