A Taliban spokesman on Tuesday warned Pakistan's government to end a military crackdown against insurgents in a restive northwestern mountain valley or face suicide bombings. Maulvi Umar said the government has run out of time and must stop the current military operation in the Swat Valley, where the army says bloody clashes this week have left 125 dead. "Our ultimatum has ended. Now they have made a strike and it is our turn to strike whether it will be tomorrow, the day after tomorrow or whenever," Umar told a news conference in a village mosque in Bajur tribal region bordering Afghanistan. Umar is spokesman for Tehrik-e-Taliban Pakistan, an umbrella organization of militant groups led by Baitullah Mehsud, the country's top Taliban leader.