Quetta, Pakistan (CNN) A suicide bomber attacked Pakistani police and troops Tuesday, killing six officers and leaving at least eight others injured, authorities say.

The assailant targeted the police officers in the southwestern city of Quetta, ramming his explosive-laden motorcycle into a police van that was traveling to the airport, district police Superintendent Razzaq Cheema told CNN.

ISIS claimed responsibility in an online statement published by group's Amaq media wing. The statement did not provide evidence that the terror group was behind the blast.

Prime Minister Shahid Khaqan Abbasi strongly condemned the attack.

Earlier Tuesday, two other suicide attacks targeting police checkpoints took place on the outskirts of the city, injuring eight military personnel.

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