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Pakistani authorities have released 11 Iranian Revolutionary Guards who were detained a day earlier for trespassing into Pakistani territory.
The Guards were arrested in the Mashkhel area, on the border with Iran, a week after a suicide bomber killed 42 people in Iran, including six senior Revolutionary Guards Commanders.
A Sunni Muslim Group, Hundollah, claimed responsibility for the blast, and Iran said the group operated from Pakistan. It urged Pakistan to hand over its leader, Abdolmalik Rigi. Pakistan has assured Iran that it will cooperate in tracking down and punishing those behind the attack, but has denied that Rigi is in Pakistan.
Relations between Iran and Pakistan have generally been good, but tension has risen after Iran said last week's suicide bombing would affect relations.