The cause of the November 12 helicopter crash during a military mission in Egypt's Sinai, in which Czech female staff sergeant Michaela Ticha died, may have been no accident but an attack by Islamist militants, President Milos Zeman said at a meeting of top military commanders today. However, Chief-of-Staff Ales Opata said he had no such information. "At any rate, there is a U.S. military investigating team on the spot to look into the whole matter. We are not able to anticipate anything today," he added.