21. The blast came more than half an hour after one warning call to The Associated Press office. 22. On some occasions the attacks have been preceded by warning calls to allow Palestinians to take cover. 23. In a practice codenamed roof knocking, the IDF issued warning calls before air strikes on civilian buildings. 24. The blast was preceded by an anonymous warning call from someone who sounded like a white American male. 25. A drought warning calls for local officials to increase pressure to conserve _ but without instituting mandatory measures. 26. A warning call minutes before helped police avert a catastrophe by evacuating the building and cordoning off entrances. 27. That hideous warning call that golfers hate to utter and hope not to hear is welcomed these days. 28. Police said a warning call received at the Leeds General Infirmary was not accompanied by a code word. 29. Police said they received a warning call an hour before the blast by someone claiming to represent ETA. 30. He collaborated with Warning Call ".
