Pakistani terrorists arrested in plot to kill US Ambassador

HEADLINE: Afghanistan Arrests Pakistanis in Alleged Plot to Kill US Ambassador

INTRO: Afghan officials have arrested three Pakistani men they say were plotting to assassinate the U.S. ambassador to Afghanistan. The arrests come just hours after the U.S. military announced that increasing numbers of foreign militants have entered Afghanistan, apparently to help Taleban insurgents fight the central government. VOA's Benjamin Sand reports from Islamabad.