[IMG]http://d.yimg.com/a/p/afp/20100507/capt.p***o_1273210395484-1-0.jpg?x=130&y=86&q=85&sig=7VAsK5GKl7xPVutp29TCtg--[/IMG]AFP - Gunmen attacked a police checkpoint in northwest Pakistan at dawn on Friday, killing four policemen before speeding away in a getaway vehicle, police said.
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