Darrell Scott in Studio B on February 26, 2012.

The head of American and NATO forces in Afghanistan has recalled all Western military advisers from government ministries after two high-ranking U.S. military officers were shot dead.

Officials say the gunman has not been identified, but a manhunt is under way.

Reporting from Kabul, NPR's Quil Lawrence says the officers died inside a high-security area of the Afghan Interior Ministry building after an individual turned his weapon on them.

Two American military officers were shot and killed today in the heavily guarded Interior Ministry building in Kabul. Weekends on All Things Considered host Guy Raz speaks to Kabul bureau chief Quil Lawrence about the shootings, which follow five days of riots and protests over the burning of Koran's at a NATO base earlier this week.

Gas prices are on the rise and there's a slew of possible reasons as to why. Tensions with Iran, the Obama administration's policies, and Wall Street speculators have all been cited as factors. But it still doesn't answer why prices are increasing while U.S. demand for gasoline is going down. Weekends on All Things Considered host Guy Raz talks with NPR's John Ydstie about some hidden factors behind the jacked up gas prices.

Earlier today, a court ended a corruption trial against Silvio Berlusconi. But that's not the end of the road for the former prime minister, he still faces charges that he paid an underage teenager for sex. Friends of Berlusconi say that he is lonely and increasingly isolated. Weekends on All Things Considered host Guy Raz talks to writer Philip Delves Broughton who got unprecedented access to Silvio Berlusconi in Rome and wrote about the interview for The Atlantic.

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As the assault against Homs continues, Secretary of State Clinton is urging Syrian security forces to disobey orders from their own commanders and stop the violence against protesters. Aram Nerguizian researches Middle East military strategy at the Center for Strategic and International Studies. We asked him about the possibility of further defections among the ranks.

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SCOTT SIMON, HOST:

This is WEEKEND EDITION from NPR News. I'm Scott Simon. Time for sports.

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SIMON: One of baseball's best young stars has his drug ban overturned. So why isn't Major League Baseball celebrating? Also, Lin takes some Heat in Miami and another big Tiger Woods putt just rolls away. When will they start to drop? NPR sports correspondent Tom Goldman joins us.

Morning, Tom.

TOM GOLDMAN, BYLINE: Hiya, Scott.

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There's a limited humanitarian effort already underway in Syria. The Red Cross is in the process of evacuating injured people from the embattled Homs neighborhood of Baba Amr. At least 27 people are reportedly receiving medical treatment after being driven out in ambulances yesterday. The evacuation comes after a week in which Baba Amr was pounded by some of the heaviest artillery attacks by the Syrian government.