Polish Foreign Minister Radoslaw Sikorski on Monday denounced the execution of a Polish hostage by the Pakistani Taliban and vowed to hunt down his killers. "The cassette of the execution, this bestial execution, is authentic and unfortunately it confirms the worst," Sikorski told reporters. "Now we can no longer save our compatriot, we are going to try to punish his killers," he added. "After consultation with the justice minister, we are issuing arrest warrants to arrest the men suspected of having committed this crime."