Chabad Lubavitch is a movement made up of Jews that follow the teachings of the late Lubavitcher Rebbe Menachem Mendel Schneerson. Many of these Chabadniks have spread themselves around the world in order to give Jews an opportunity to explore their Jewish roots and heritage no matter where they might live. They truly believe in the Jewish concept of loving your neighbor as much as you love yourself.
We pray for the the safety of Rabbi Gavriel and his wife Rivka along with all of those who are being held by the terrorists. Their Jewish names are: Gavriel Noach ben Frieda Bluma and Rivka bas Yehudis.
Please take a moment to say Tehillim/Psalms 20, traditionally said in times of trouble.
The Financial Times has a good article with a bit more information.