The U.S. Embassy in Berlin received a series of phone calls Oct. 31 threatening Americans and saying that children would be involved. Police notified schools with large numbers of American children and agreed to provide additional support there. Beyond that there is little to go on. Remain alert to your surroundings and remember that the phone number for emergencies in Germany is 110. Also consider subscribing to the U.S. Mission Germany e-warden system to receive U.S. Government security-related information. Do so by sending your e-mail address to