Tonight on PBS

PBS news weekend, the growing divide between American conservative Catholics and Pope Francis over the direction of the church. Then after actor Matthew

Perry's autopsy says he died from the acute effects of ketamine, a closer look at

the drug and it's increasing use.

And we meet the first group of inmates

to graduate from Northwestern University's

Prison Education Program.

This is what equal opportunity looks like.

When there's not the roadblocks that's keeping us from being able to compete,

and if you give us that chance to succeed,

like I said, the cream is going to rise to the top. Good evening. I'm John Yang.

I'm John Yang.

Tonight, fresh questions are being raised about the conduct of Israeli ground forces in Gaza after military

officials said that the three hostages mistakenly killed were carrying a white flag and were

shirtless both apparent efforts to show they were unarmed.

An Israeli military official who spoke on the condition of anonymity said the soldiers

thought the three posed a threat.

The official also said the troops violated Israel's rules of engagement and the incident is being investigated at the highest level.

It's increased public pressure on the Israeli government to release Palestinian prisoners in exchange for the 129 or so remaining hostages.

Hundreds of protesters blocked traffic in Tel Aviv last night. We demand that the Israeli government talk to us today and explain to us what

proposal is on the table and don't wait for the USA that's what is needed. If not, my child comes back in a bag.

And I'm sure none of you would want to see their child return in a bag.

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