The story

At least 41 people were killed and dozens wounded in a blast Monday at a security forces checkpoint in northwest Pakistan, authorities said.

About 45 people were injured in the explosion in the Shangla district in the volatile Swat Valley, said Syed Altaf Hussein, a senior government official in the area.

The explosion targeted a military vehicle, officials said. Read full article »

CNN's Reza Sayah contributed to this report.

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