In 423 BCE, Nebuchadnezzar's troops breached the walls of old Jerusalem and entered the city. Four weeks later, the Holy Temple was destroyed, and the Jews were exiled to Babylon. Originally, a day of fasting and mourning was observed on the 9th of Tammuz. Seventy years later, however, when the Second Temple was built, the fast was abolished and the day was turned into a holiday. Some 500 years later when Jerusalem fell on the 17th of Tammuz -- prior to the destruction of the Second Temple -- the Sages decreed the 17th of Tammuz as a fast day to commemorate both tragedies. (Source)
~ Shabbat Shalom ~

Tamuz message #1 from the Journal of Meir Yisroel
I believe that from the Seventeenth of Tamuz the world will rock and change in a most drastic way. I can’t be a hundred percent sure of the date. However it is coming one way or another and it definitely will be enough to shake up most of the population of the world into a new and very frightening reality that they cannot deny anymore.
Shiva Asar b'Tamuz is next Shabbat!